| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Census of Porto Rico, Taken Under the Direction of the War Department, U.S.a.: Bulletin No. 1-3 | 978-1-112-59405-2 (1-112-59405-1) | 2010 |
| Report on the Census of Porto Rico, 1899: Lt. Col. J.P. Sanger, Inspector-General, Director. Henry Gannett, Walter F. Willcox, Statistical Experts | 978-1-112-52567-4 (1-112-52567-X) | 2009 |
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United States War Dept. Strategic Services Unit History Project