Introduction: Hal Scheffler’s Extensionism in Historical Perspective and its Relevance to Current Controversies

Shapiro, WarrenRead, Dwight2020-05-202020-05-209781760461812http://hdl.handle.net/1885/204502en-AUAuthor/s retain copyrighthttps://creativecommons.org/licenses/by-nc-nd/4.0/Introduction: Hal Scheffler’s Extensionism in Historical Perspective and its Relevance to Current Controversies2018-0410.22459/FEK.04.2018.00Creative Commons licence (CC BY-NC-ND; creativecommons.org/licenses/by-nc-nd/4.0/)