 In 1892 , Cope ( then 52 years old ) was granted expense money for field work from the Texas Geological Survey . With his finances improved , he was able to publish a massive work on the <unk> of North America , which was the most detailed analysis and organization of the continent 's frogs and amphibians ever mastered , and the 1 @,@ 115 @-@ page The Crocodilians Lizards and Snakes of North America . In the 1890s , his publication rate increased to an average of 43 articles a year . His final expedition to the West took place in 1894 , when he prospected for dinosaurs in South Dakota and visited sites in Texas and Oklahoma . The same year , Julia was married to William H. Collins , a Haverford astronomy professor . The couple 's ages — Julia was 28 and the groom 35 — were past the conventions of Victorian marriage . After their European honeymoon , the couple returned to Haverford . While Annie moved to Haverford , as well , Cope did not . His official reason was the long commute and late lectures he gave in Philadelphia . In private correspondence , however , Osborn wrote that the two had essentially separated , though they remained on amiable terms . 
