This series documents Laverty's family history, his military service, and his personal life. Material documenting the Laverty family includes family correspondence, and clippings and photographs documenting both his father's horse breeding business and his brother's soccer career. This material dates from the 1920s through the 2000s and includes correspondence, photographs, clippings, and ephemera. Material documenting Laverty's time in the United States Army and the Army Reserves Special Forces dates from the 1950s through the 1960s and includes correspondence, training documents, photographs, and Laverty's personnel file. This material also includes newsletters for Army retirees, Special Forces retirees, and retiree organizations formed around Army bases at which Laverty was stationed, including Fort Monmouth in New Jersey. Material documenting Laverty's personal life consists of correspondence with friends from Ireland and the United States, and dates from 1948 to 2007.

This series documents Laverty's working life in the journalism field, from the 1950s through the 2000s. Material includes McGraw-Hill publications featuring Laverty and material documenting Laverty's 30 years as publisher of the weekly newsletter, Automotive Week. The latter includes the newsletter, correspondence regarding its publication and subscriptions, correspondence and legal documents regarding the sale of the newsletter in the early 2000s, and copyright documents.

This series documents Laverty's almost 60 years of involvement with the Irish Brigade Association (IBA) and his interest in the 69th Regiment of the United States Army. Material in this series dates from 1861 through 2014, with the bulk of the material dating from the early 2000s. The material includes correspondence, newsletters, paper and born-digital business and subject files, print photographs, a video recording, and ephemera. The correspondence documents Laverty's involvement in the organization from its founding in the 1960s through his work as the organization's president in the early 2000s and includes correspondence between Laverty and members of Congress, librarians and archivists, historians, and other members of the IBA. The subject files document the organization's work to locate the graves of former members of the regiment, through correspondence with research organizations and cemeteries, and paper and born-digital lists compiled by Laverty of confirmed and unconfirmed grave sites in cemeteries in New York and other states. The business files consist of correspondence and notes regarding meetings and events planned by the IBA. The video recording contains footage of members of the IBA marching in the New York City St. Patrick's Day parade and the ephemera consists of ribbons from IBA events. Other topics covered by this series include articles and books written by and about the IBA and members of the regiment, Civil War reenactment events, members of religious orders who served as medical personnel with the regiment, and Laverty's personal interest in particular members of the Regiment, including Thomas Francis Meagher and James McKay Rorty. In addition to the IBA's newsletter, The Irish Volunteer, this series also includes newsletters published by the the 69th Volunteer Corps, and the Veterans Corps 69th Regiment.

This series documents Laverty's over 50 years of historical research, focused on the Irish in the United States and Irish-Americans. The main topics of this series include the role of the Irish in American wars, from the Revolutionary War through the Spanish-American War, with a focus on the Civil War; members of the United Irishmen and the Fenian Brotherhood who immigrated to the United States in the 19th century; and members of religious orders who served as medical personnel during the Civil War. Material in this series dates from 1767 to 2014, with the bulk of the material dating from the 1990s and 2000s, and includes notes, printouts from online sources and photocopies of primary and secondary sources with some notes, books and pamphlets, photographs, maps, correspondence, writings by Laverty, and 18th and 19th century documents purchased by Laverty. The bulk of the material consists of photocopies of biographical data from secondary and primary sources, with notations by Laverty, and lists of and notes on reference sources, including book and article titles, names of historical and research institutions, and names of people to contact regarding Laverty's research interests. Other material in this series includes lists and notes Laverty compiled from his research files to include in a project first conceived of as a five volume encyclopedia to be titled Encyclopedia of Irish-American Military History, and was later hosted on a website titled IrishAmericanIndex.com. Other topics of interest to Laverty were cemeteries, in particular grave sites and monuments to Irish and Irish-American soldiers and religious serving as medical personnel; Irish indentured servants in the American colonies; and all Irish settlements in the American colonies and the United States, in particular Cecil County, Maryland.

This series documents Laverty's participation in numerous organizations related to his interests in history and Irish republican politics. Material in this series dates from 1926 to 2014, with the bulk of the material dating from 1980s through the 2010s and includes correspondence, ephemera, publications, news releases, and paper and born-digital administrative documents. Laverty's membership in the New York Irish History Roundtable (NYIHR) and the American Irish Historical Society is documented through correspondence between Laverty and members of both organizations, publications created by both organizations, and agenda and meeting minutes from NYIHR meetings. Irish republican organizations documented in this series include Sinn Féin, Clan na Gael, the Irish American Unity Conference, and multiple organizations devoted to the cause of Irish political prisoners during the 1970s and 1980s. Material in this series includes correspondence with members of these organizations, dating from the 1950s through the 2000s; newsletters and ephemera created by these organizations, dating from the 1960s through the 2000s; and internal memoranda dating from the 1950s through the 1960s.

This series documents the career and research interests of William V. Kennedy, with material dating from the 1950s through the 2000s. Material includes scrapbooks, correspondence, and legal documents. The scrapbooks contain clippings of Kennedy's articles on the military, military history, and the role of religion, particularly Catholicism, in the military. Kennedy's correspondence documents his work as an instructor at the United States Army War College, his participation in the Thompson Battalion Memorial Project Committee, and the lawsuits he brought against the Army War College in the 1980s. The latter are supported by legal documents created through these suits.