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COMPARISON OF SAMPLE RULES FOR ESTIMATING JACK PINE DENSITY, BASAL AREA, AND PERCENTAGE WITH SWEETFERN RUST CANKERSGROSS HL; EK AR; PATTON RF et al.1980; CAN. J. FOR. RES.; CAN; DA. 1980; VOL. 10; NO 2; PP. 190-198; ABS. FRE; BIBL. 17 REF.Article