EXTENSION PROGRAM IN CHANGING AGRICULTURE

被引：1

作者：

AHLGREN, HL

机构：

来源：

关键词：

D O I：

10.3168/jds.S0022-0302(62)89412-0

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

引用

页码：438 / &

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