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- AuthorsJames G. SchroederSourceRes. Pap. NE-88. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 16 p.Year1967
- AuthorsDavid G. MartensSourceRes. Pap. NE-89. Upper Darby, PA: U. S. Department of Agriculture, Forest Service Northeastern Forest Experiment Station. 38 p.Year1967
Plastic tubing for collecting maple sap: a comparison of suspended vented and unvented installations
AuthorsBarton M. BlumSourceRes. Pap. NE-90. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 13 p.Year1967- AuthorsRobert W., Jr. Wilson, Robert C. PetersSourceRes. Pap. NE-70. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 14 p.Year1967
- AuthorsRobert W., Jr. Wilson, Robert C. PetersSourceRes. Pap. NE-71. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 12 p.Year1967
- AuthorsRobert C. Peters, Robert W., Jr. WilsonSourceRes. Pap. NE-72. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9 p.Year1967
- AuthorsRobert W., Jr. Wilson, Robert C. PetersSourceRes. Pap. NE-73. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 11 p.Year1967
- AuthorsRobert C. Peters, Robert W., Jr. WilsonSourceRes. Pap. NE-74. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 25 p.Year1967
- AuthorsRobert C. Peters, Robert W., Jr. WilsonSourceRes. Pap. NE-75. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 22 p.Year1967
- AuthorsRobert W., Jr. Wilson, Robert C. PetersSourceRes. Pap. NE-76. Upper Darby, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 7 p.Year1967