Advances in San Juan Basin paleontology, c1981: title page (Spencer G. Lucas)

Dinosaurs, 1999: CIP title page (Spencer Lucas)

The Permian timescale, 2018: title page (co-editor: S.G. Lucas, New Mexico Museum of Natural History, USA)

New Mexico Museum of Natural History website, October 8, 2020: Spencer G. Lucas (Spencer G. Lucas, Ph. D., Curator of Paleontology; Email: spencer.lucas@state.nm.us; B.A. from the University of New Mexico (1976) and a M.S. (1979) and Ph.D. (1984) from Yale University; a paleontologist and stratigrapher; He) http://www.nmnaturalhistory.org/paleontology-curators/spencer-g-lucas-ph-d

Wikipedia, October 8, 2020: Spencer G. Lucas (Spencer George Lucas is an American paleontologist and stratigrapher, and curator of paleontology at the New Mexico Museum of Natural History and Science) https://en.wikipedia.org/wiki/Spencer_G._Lucas