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- The expanding universe. Discussion of Lemaître's solution of the equations of the inertial field (Errata: 5 V)
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- Photographic magnitudes of stars brighter than 7<SUP>m</SUP>.5 between declination +80° and the pole (Errata: 6 224)
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- On the orbital motion to be expected in double stars of given magnitude separation and proper motion
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- Two new, peculiar and similar variable stars, found by P. Th. Oosterhoff and H. van Gent respectively, estimated and discussed by -