American Naturalization Records, 1790-1990: What They Are and How to Use Them by John J. Newman (Heritage Quest, $12.95)
Guide to Naturalization Records of the United States by Christina K. Schaefer (Genealogical Publishing Co., $25)
Immigrant and Passenger Arrivals: A Select Catalog of the National Archives Microfilm Publications, 2nd edition (National Archives Trust Fund Board, $3.50) or see
Ships of Our Ancestors by Michael J. Anuta (Genealogical Publishing Co., $34.95)
They Became Americans: Finding Naturalization Records and Ethnic Origins by Loretto Dennis Szucs (Ancestry, $19.95)
They Came in Ships: A Guide to Finding Your Immigrant Ancestor's Ship, revised edition, by John Philip Colletta (Ancestry, $9.95)
A Genealogist's Guide to Discovering Your Immigrant & Ethnic Ancestors by Sharon DeBartolo Carmack (Betterway, $18.99)