Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
A contribution to the vertebrate paleontology of Brazil: Second continuation of researches among the batrachia of the coal measures of Ohio
A contribution to the vertebrate paleontology of Brazil: Second continuation of researches among the batrachia of the coal measures of Ohio