Rutgers University1 Received for publication May 14, 1959 ??urnal series paper of the New Jersey Agr. ?? Sta., Rutgers University, the State Univer?? of New Jersey. These studies were aided by a ??act between the O.N.R., Department of the ??, and the Arctic Institute of North America. ??oduction in whole or in part permitted for any ??se of the United States Government. The ??rs extend their appreciation to Jerry Brown, ?? Drew, and R. E. Shanks for important field ??ssions and general assistance in carrying out ??vestigation. Appreciation is also extended to ?? Starkey for his critical review of the manu??
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Douglas et al. (1959) studied this question.
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