The book Turkey Management by Stanley J. Marsden and J. Holmes Martin, Interstate Publishing (1939).
For more detailed information on the principles and practices of breeding turkeys (and
everything else involved with turkey management), the Marsden and Martin book cited above is
highly recommended reading. The book is out of print, but a used copy can be purchased through
various online resources. The book can also be viewed in its entirety in electronic form through
the Cornell Universitys Core Historical Literature of Agriculture digital collection at
http://chla.library.cornell.edu/c/chla/ . The book itself is over 700 pages long but it is a
worthwhile read for turkey producers. It was written at a time when heritage turkeys were the
mainstream for production and the principles are much the same now as they were then.
When I searched the book, this is the link that I got.
http://chla.library.cornell.edu/cgi/t/text/text-idx?c=chla;idno=3317008
It looks like very good information. Thanks!