United States. General Accounting Office
Eric Sloane
Rolfe Cobleigh
United States. Agricultural Research Service
Tony Mitton
Peter Henderson & Co
Harris Pearson Smith
Caroline Young
George A. Martin
United States. Bureau of the Census
Geo. Tait & Sons, Inc
Timothy W. Dell
Charles Walters
F.H. Woodruff & Sons
Noah Blake
Glen Charles Cook
[author not identified]
Czesław Kanafojski