1. El jurásico inferior de México y sus amonitas Author/Creator: Erben, Heinrich Karl Publication/Creation: [Mexico] : [publisher not identified], [1956] Resource Type: Book Access & Availability: Loading
2. El Jurásico Medio y el Calloviano de México Author/Creator: Erben, Heinrich Karl Publication/Creation: [Mexico] : [publisher not identified], [1956] Resource Type: Book Access & Availability: Loading