TY - BOOK AU - Essig, E. O. (Edward Oliver) TI - The pear thrips PB - University of California, College of Agriculture, Agricultural Experiment Station PY - 1920 T2 - Circular / College of Agriculture, Agricultural Experiment Station, University of California VL - no. 223 EP - 9 p. UR - http://ci.nii.ac.jp/ncid/BB1825400X ER -