The Calvert was a Crescent City Class “Type C3” cargo ship originally built under the US Maritime Commission (MARCOM). This class of ship was originally designed in the late 1930s.
Additional details on Crescent City Class ships:
- Wikipedia: http://en.wikipedia.org/wiki/Crescent_City-class_attack_transport
- Shipscribe:
- Excellent history of the Crescent City Class: http://www.shipscribe.com/usnaux/APA/APA21.html
- Photographs and annotations for Crescent City Class ships, including the Calvert: http://www.shipscribe.com/usnaux/APA/APA21-p.html
Additional details on “Type C3” cargo ships:
More links will be added as I find information on the web.