The above link is to Agricultural Yearbooks from 1894 to 1992.

Selected issues linked below:

• Yearbook of Agriculture 1896 -- J.S. Morrill and William H. Hatch on the front cover.
• Yearbook of Agriculture 1911 -- Seaman A. Knapp on the front cover.
• Yearbook of Agriculture 1912 -- Norman J. Colman, First Secretary of Agriculture on the front cover.
• Yearbook of Agriculture 1918 -- U.S.A. involved in World War I most of the year.
• Yearbook of Agriculture 1943-47 -- U.S.A. involved in World War II (1941 to 1945)

Extension Related History

• A History of Agricultural Extension Work in United States from 1785 to 1923

• Extension Timeline from 1785 to 2000

• Extension History in Minnesota (1849-to-present)

• School Education in 1919 -- page 7, references Extension Work with Boys and Girls

• Ohio Extension Service News (1924 to 1927)

• The Spirit and Philosophy of Extension Work -- Copyright, 1952, by Epsilon Sigma Phi

  Note: This book is a record of the pioneers in extension work. It documents the important declarations of policy
  and philosophy that have guided the federal and state extension services through the years.

• Extension Philosophies Used in Other Countries

• Cooperative Extension Service History Kansas (1956 to 1962)

• Role of Extension Service in Rural Development, May 1960

• Cooperative Extension Service History Kansas -- Chapter 5 (1965 to 1988)

• Agricultural Extension A Reference Manual -- Written in 1972

• Journal of Extension Archive (1963 to 2020)

• Improving Agricultural Extension. A Reference Manual

• Historic Perspective of the Social Contract With U.S. Agriculture

• Federal Adult Education A Legislative History (1964-2013)

• History of the National Association of County Agricultural Agents (1977-1988)

• The History, Development, and Future of Agricultural Extension

• Improving the Transfer and Use of Agricultural Information: A Guide to Information Technology, 1994

• Dial "A" for Agriculture: A Review of Information and Communication Technologies for Agricultural Extension in Developing Countries, March 2011

• Farm Bill Food for Thought: Research and Extension, August 2018

Epsilon Sigma Phi History

• PowerPoint Presentation about the History of Epsilon Sigma Phi

• Epsilon Sigma Phi Song

• Past National ESP Presidents

• Ruby Award Lectures by Year

• Year and Location of National Epsilon Sigma Phi Conferences

• ESP Conference Pins

• ESP Connection Newsletter

The above link is to an ESP Connection Newsletter Archive that has all newsletters from December 1997 (Issue 70) to September 2020 (Issue 179). Still attempting to find early issues (Issues missing are 69, 64, 63, 61, 58 thru 53, 50, 46 thru 38, and 36 thru 1).

Extension Service Review

The Review offered the Extension worker, in their role of educational leader, professional guideposts, new routes, and tools for speedier, more successful endeavor. Through this exchange of methods, tried and found successful by Extension agents, the Review serves as a source of ideas and useful information on how to reach people and thus help them utilize more fully their own resources, to farm more efficiently, and to make the home and community a better place to live.

The table links to Extension Service Review issues compiled by year.

1930	1931	1932	1933	1934	1935	1936	1937	1938	1939
1940	1941	1942	1943	1944	1945	1946	1947	1948	1949
1950	1951	1952	1953	1954	1955	1956	1957	1958	1959
1960	1961	1962	1963	1964	1965	1966	1967	1968	1969
1970	1971	1972	1973	1974	1975	1976	1977	1978	1979
1980	1981	1982	1983	1984	1985	1986	1987	1988	1989
1990	1991	1992