TY - BOOK ID - 137620831 TI - Comparison of black pine leaf scale population-density on normal ponderosa pine and those weakened by other agents AU - Edmunds, George F. AU - Allen, Richard K. PY - 1958 PB - S.l. s.n. DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:137620831 AB - ER -