COMPANHIA DE PESQUISA DE RECURSOS MINERAIS. Projeto Torres - Gravataí: relatório final de pesquisa, bloco Torres - carvão mineral, alvarás 2.330/81, 2.847/81, 2.848/81, 2.849/81, 2.788/81, 2.789/81, 3.158/81, 2.850/81, 3.159/81, 3.160/81, 2.341/81, 3.161/81, 2.760/81, 2.761/81, 2.851/81, 2.278/81, 2.852/81, 2.342/81, 2.762/81, 2.763/81, 2.331/81, 2.332/81, 2.333/81, 2.228/81, 2.334/81, 2.335/81, 2.336/81, 2.337/81, 2.338/81, 2.420/81, 2.339/81 e 2.340/81. Porto Alegre: CPRM, 1983. O volume 1 está no Acesso Livre como REL 3520.

https://rigeo.cprm.gov.br/handle/doc/11192

https://repositorioslatinoamericanos.uchile.cl/handle/2250/9188228