Columbia subject headings:
Burgess Shale (B.C.)
Contingency (Philosophy)
Invertebrates, Fossil.
Paleontology--British Columbia--Yoho National Park.
Paleontology--Cambrian.
Paleontology--Philosophy.
Yoho National Park (B.C.)
Harvard subject headings:
Burgess Shale (B.C.)
Contingency (Philosophy)
Invertebrates, Fossil
Invertebrates, Fossil--British Columbia--Yoho National Park.
Invertebrates, Fossil.
Paleontology--British Columbia--Yoho National Park.
Paleontology--Cambrian
Paleontology--Cambrian.
Paleontology--Philosophy.
Yoho National Park (B.C.)
Princeton subject headings:
Burgess Shale (B.C.)
Contingency (Philosophy)
Invertebrates, Fossil.
Paleontology--British Columbia--Yoho National Park.
Paleontology--Cambrian.
Paleontology--Philosophy.
Yoho National Park (B.C.)