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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, Ottawa vol. 15, no. 4, 1955 p.
351-354,
https://doi.org/10.4095/314494 
Open Access