Sinclair Oil Corp. (Salt Lake City, UT)
Perhaps the Sinclair Refining Company's most successful single promotion was the issuance in 1935 of a dinosaur stamp album which could be filled only with colored dinosaur stamps issued one at a time weekly at service stations.

Prehistoric Animal Stamps - 1935-1938 (16 sheetlets of 3)

1   Moschops - ancestral; Archelon - turtle; Psittacosaurus
2   Ramphorhynchus - flying reptile; Pareiasaurus - Permian reptile; Protosuchus - crocodilian
3   Mystriosuchus - crocodilian; Iguanodon; Hypsilophodon
4   Placodus - marine reptile; Troödon; Camarasaurus

5   Cynognathus - mammal-like; Ichtyornis - bird; Brachyceratops
6   Dimetrodon - Permian reptile; Nyctosaurus - flying reptile; Brachiosaurus
7   Edaphosaurus - Permian reptile; Cycnoramphus - flying reptile; Champsosaurus - crocodilian
8   Triceratops; Pteranodon - flying reptile; Palaeoscincus

9   Camptosaurus; Corythosaurus; Allosaurus
10   Monoclonius; Stegosaurus; Brontosaurus (Apatosaurus)
11   Ornitholestes; Parasaurolophus; Tyrannosaurus
12   Protoceratops; Trachodon (Edmontosaurus); Ceratosaurus

13   Styracosaurus; Ankylosaurus; Diplodocus
14   Archaeopteryx; Ichthyosaurus - marine reptile; Mosasaurus - marine reptile
15   Hesperornis - bird; Struthiomimus; Plesiosaurus - marine reptile (pink & orange)
16   Hesperornis - bird; Struthiomimus; Plesiosaurus - marine reptile (brown & yellow)