Ralph M. Richardson

• Farmer cooperative statistics 1980
• Farmer cooperative statistics, 1981
• Farmer cooperative statistics, 1982
• Farmer cooperative statistics, 1983
• Farmer cooperative statistics, 1984
• Farmer cooperative statistics, 1985
• Farmer cooperative statistics, 1986
• Farmer cooperative statistics, 1987
• Farmer cooperative statistics, 1988
• Farmer cooperative statistics, 1991
• Farmer cooperative statistics, 1993
• Farmer cooperative statistics, 1994