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- [21] SUMMARY OF READING INVESTIGATIONS (JULY 1, 1930, TO JUNE 30, 1931). II[J]. ELEMENTARY SCHOOL JOURNAL, 1932, 32 (07): : 510 - 520Gray, William Scott
- [22] SUMMARY OF READING INVESTIGATIONS (JULY 1, 1930, TO JUNE 30, 1931). III[J]. ELEMENTARY SCHOOL JOURNAL, 1932, 32 (08): : 587 - 594Gray, William Scott
- [23] The opposition of planets of Eros 1930/1931.[J]. NATURWISSENSCHAFTEN, 1930, 18 : 910 - 913Kopee, A
- [24] Fatal Industrial Accidents in Canada, 1930 and 1931[J]. MONTHLY LABOR REVIEW, 1932, 34 (05) : 1072 - 1072不详
- [25] The Conditions of Agricultural Workers in Poland in 1930 and 1931[J]. INTERNATIONAL LABOUR REVIEW, 1933, 27 (01) : 66 - 73Gnoinski, J.
- [26] Russian oil fields in 1930-1931[J]. TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1932, 98 : 221 - 226Beckstrom, RC
- [27] The Cooperation Committee Program for 1930-1931[J]. PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1931, 19 (07): : 1171 - 1174不详
- [29] General Survey of Wages in Switzerland, 1930 and 1931[J]. MONTHLY LABOR REVIEW, 1932, 34 (03) : 688 - 695Blake, Gibson G.Ramsay, Hugh F.Sherman, TuckScott, Albert W.Baldwin, Frederick W.