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[[embossed image of a bird]] 50 formed the basis of the great series of monographs of the North American rodents published by [[strikethrough]] Messrs. [[/strikethrough]] Drs. Coues and Allen in 1877, of which more will be said in another connection. The region from which these collections were derived, [[strikethrough]] included [[/strikethrough]] comprized nearly the [[strikethrough]] entire [[/strikethrough]] whole country between the Mississippi and the Pacific sea-coast. The Northwestern Boundary [[strikethrough]] [[?]] [[/strikethrough]] survey still combined to furnish some specimens at this time, and collections were also received from the Northern Pacific Railroad survey, especially in 1873. [[strikethrough]] In [[/strikethrough]] Between 1872, [[strikethrough]] 1873 and 1874 [[/strikethrough]] and 1877 large numbers of the pinnipeds native to [[strikethrough]] the [[/strikethrough]] Alaska and the adjacent region were received from a number of sources, notably from the Alaska Commercial Compy and officers [[strikethrough]] attached to [[/strikethrough]] in the U.S. Signal service U.S. Coast Survey and U.S. Revenue Marine. [[strikethrough]] The unique [[/strikethrough]] In [[strikethrough]] [[?]] [[/strikethrough]] 1874 the department received a notable addition in the form of a pair of skins and skeletons of the Musk-ox, collected by Mr. W.L. Hardesty of the Hudson's Bay Company's service.