• 2 Wisconsin Historical Society Library
• 1 Map Library (Robinson)
• 1 WHS State Archives Preservation Facility

• 5 Journals, Magazines, Newspapers
• 2 Maps, Atlases

• 1 Administrative and political divisions
• 1 Census districts
• 1 Politics and government

• 1 Movimiento Pro Independencia de Puerto Rico
• 1 Partido Socialista Puertorriqueño
• 1 United States. Adjutant-General's Office. Military Information Division
• 1 United States. Bureau of the Census. Data Preparation Division
• 1 United States. Bureau of the Census. Geography Division

• 5 English

• 3 San Juan (P.R.)
• 2 Ponce (P.R.)
• 1 British Virgin Islands
• 1 Caguas
• 1 Caguas (P.R.)
• 1 Ponce
• 1 San Juan
• 1 United States Virgin Islands

Limit year range