He authored a book , The Hamster Manual , which had a distribution of 80,000 copies by its 6th edition in 1951 .
Marsh was successful in part because of the professionalism he brought to the art of hamster husbandry .
Marsh authored a book , The Hamster Manual , which had a distribution of 80,000 copies by its 6th edition in 1951 .
Marsh was successful in part because of the professionalism he brought to the art of hamster husbandry .