207. Application of the principle of interactions to agricultural development. Pan American Soil Conservation Congress Proceedings, Sao Paulo, 1966

Series II includes originals and photocopies of Kellogg's published works as well as some related correspondence. This series is arranged in original, rough chronological order according to Kellogg's numbering system, which is described in the key to publications at the beginning of the series. Publications not listed in the key were added to the end of the series and are arranged in chronological order.