This book contains a wealth of information about aliens—non-citizens—living in New Mexico during World War I. While the intent was to register German men, these records include men from other European countries, women of German descent, and women married to Germans. The extracted records include details about the alien’s birth, parents, immigration, and physical appearance. Information about spouses, children, and siblings are also available for most records. The fully indexed book includes background information on alien registrations.