0. DOCID:13253 1936 "The McDonald Observatory" 0.0206719210412407
1. DOCID:14439 1940 "Abstracts of Papers" 0.0191415910863796
2. DOCID:14366 1940 "The Active Region on the Sun's Surface" 0.0189767491110975
3. DOCID:14629 1941 "Note on an Erroneous Statement Concerning Pre-Nova Stars" 0.0184048685664904
4. DOCID:11940 1930 "The National Academy of Sciences. II" 0.0179665269373824
5. DOCID:13044 1935 "Abstracts of Papers" 0.0164649373535149
6. DOCID:12863 1934 "Variation and Evolution among the Stars" 0.0152788631515881
7. DOCID:11850 1930 "The National Academy of Sciences. II" 0.0150415758878591
8. DOCID:12104 1931 "The Harvard Program of Galactic Explorations" 0.0141038032413005
9. DOCID:14797 1942 "Correction" 0.0131540132471396
10. DOCID:11408 1928 "One Hundred Per Cent. Hatch" 0.0127250059257899
11. DOCID:13772 1938 "Americans and the Royal Astronomical Society" 0.0118816472047965
12. DOCID:13896 1938 "Magnitudes Again" 0.0111141002184487
13. DOCID:13391 1936 "Stellar Distances and the Expanding Universe" 0.0110946585650052
14. DOCID:13726 1937 "The Ursi Programs of Short-Wave Station W1xal" 0.0102333108569707