Of women and living nature : pictorial glimpses from nearly half a century of joint editorial and ancillary work by the Verdoorns in advancing historical studies of, & in furthering contemporary activities with reference to man-living nature interrelationships, interspersed with some readings by others touching upon these subjects a keepsake / offered by her friends, May 7, 1979, at the occasion of her seventieth birthday to Johanna G. Verdoorn-Hunik.