A catalogue of military tokens and chits issued in TexasRichard D. Worthington · First published 1991Open the Tome
Catalogue of the trade tokens of Chihuahua, MexicoRichard D. Worthington · First published 1990Open the Tome
Study of Life IILillian Mayberry, Richard D. Worthington, Charles E. Freeman, Richard M. Tombosky · First published 1989Open the Tome
Postmetamorphic changes in the vertebrae of the marbled salamander, Ambystoma opacum GravenhorstRichard D. Worthington · First published 1971Open the Tome
