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- [5] DROUGHT AND GRAIN-SORGHUM MINNESOTA AGRICULTURAL EXPERIMENT STATION MISCELLANEOUS REPORT, 1977, (147): : 1 - 4
- [7] PHOTOSYNTHETICALLY ACTIVE RADIATION (PAR) TRANSMITTED THROUGH SANDY SEDIMENTS EXPERIENTIA, 1981, 37 (11): : 1224 - 1224
- [9] Retrieval of the photosynthetically active radiation absorbed by boreal forest from AVHRR 22ND CONFERENCE ON AGRICULTURAL & FOREST METEOROLOGY WITH SYMPOSIUM ON FIRE & FOREST METEOROLOGY/12TH CONFERENCE ON BIOMETEOROLOGY & AEROBIOLOGY, 1996, : 124 - 127