共 9 条
- [1] BORNEBUSCH CH, 1935, T 3 INT C SOIL SCI, V3, P259
- [2] HEIBERG SO, 1937, J FOREST, V35, P36
- [3] HEIBERG SVEND 0., 1939, JOUR FOREST, V37, P42
- [4] HEIMBURGER CC, 1934, N Y CORNELL AGR EXP, V165
- [5] Hesselman H., 1926, MEDDELANDEN FRAN STA, V5, P1
- [6] KELLOGG CE, 1937, USDA MISC PUB, V274
- [7] Muller P. E., 1884, TIDSSKRIFT SKOVBRUG, V7, P1
- [8] ROMELL LG, 1931, ECOLOGY, V10, P567
- [9] [No title captured]