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A program machine for automatic operation of the Ottawa P.Z.T.; Hollinsworth, V E; in, The Ottawa photographic zenith telescope; and Method and formulae used in P.Z.T. plate measurement; and A program machine for automatic operation of the Ottawa P.Z.T.; Thomson, M M; Tanner, R W; Hollinsworth, V E. Publications of the Dominion Observatory vol. 15, no. 4, 1955 p. 351-354, https://doi.org/10.4095/314494 Open Access logo Open Access

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