Plant life - American Plant Life Society. (American Plant Life Society, 1972)

Plant life - American Plant Life Society. (American Plant Life Society, 1973)

Plant life - American Plant Life Society. (American Plant Life Society, 1974)

Plant life - American Plant Life Society. (American Plant Life Society, 1975)

Plant life - American Plant Life Society. (American Plant Life Society, 1976)

Plant life - American Plant Life Society. (American Plant Life Society, 1977)

Plant life - American Plant Life Society. (American Plant Life Society, 1978)

Plant life - American Plant Life Society. (American Plant Life Society, 1979)

Plant life - American Plant Life Society. (American Plant Life Society, 1980)

Plant life - American Plant Life Society. (American Plant Life Society, 1981)

Plant life - American Plant Life Society. (American Plant Life Society, 1982)