It is a collection of star maps from 1956 prepared by the Dominion Astrophysical Observatory. Back then, the DAO was part of the Canadian Department of Mines and Technical Surveys.
There's an inscription on the inside. "To Miss Chapple With best wishes from G. J. Odgers. April, 1959."
There are a pair of charts from each month, looking north, and looking south. They represent the sky from a location at approximately 50° latitude, in the middle of the month, at around 10:30 PM.
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