Tor Helge Nilsen / Samuel H. Clarke

UCR:31210020769871

Geology

Tor Helge Nilsen / T. E. Moore

ERDC:35925003457832

Conglomerate

Tor Helge Nilsen / Geological Survey (U.S.)

ERDC:35925003344311

Geology, Stratigraphic

Tor Helge Nilsen / Barbara L. Turner / Geological Survey (U.S.)

UCR:31210024989053

Landslides

Tor Helge Nilsen / Thomas Wilson Dibblee / Warren O. Addicott

ERDC:35925000275401

Geology

Donald A. Myers / Edwin Robert Landis / George Vincent Cohee / Henry W. Roehler / Philip Thayer Hayes / Reginald Peter Briggs / Sandra H. B. Clark / Tor Helge Nilsen / William Walden Rubey / Carle Hamilton Dane / Thomas Wilson Dibblee / Wilna B. Wright / Warren O. Addicott / William Aubrey Cobban

OSU:32435077222784

Dakota Formation

J. Alan Bartow / J. M. Hoare / Ogden Tweto / Ronald Carl Johnson / Tor Helge Nilsen / William Jasper Sando / Bernard L. Mamet / Gardner M. Pittman / Kristin A. McDougall / T. E. Moore / W. L. Coonrad / Scott McCoy

OSU:32435022086037

Algae, Fossil

James Franklin McAllister / John Beaver Mertie / John D. Peper / Tor Helge Nilsen / William Jasper Sando / Barbara L. Turner / Maurice Henry Pease / Victor M. Seiders

OSU:32435022086524

Anthozoa, Fossil

Tor Bomann-Larsen

9780752466828 / 0752466828

History

Tor Helge Nilsen / Geological Survey (U.S.)

ERDC:35925002794847

Geology

OSU:32435022086391

Geology

Tor Q. Mathisen

MINN:31951P00512804O

Farms

Tor Helge Nilsen / Thomas Wilson Dibblee

STANFORD:36105032667839

Geology

Tor Helge Nilsen

WISC:89010860062

Geology

Nicholas Sitar / Tor L. Brekke / Richard Henry Jahns / Richard H. Jahns

CORNELL:31924052584483

Engineering geology

Tor Tønsberg

UOM:39015040743182

Endangered plants

Tor Carpelan

WISC:89119613008

Finland

Tor Åge Bringsværd

WISC:89009080177

Norwegian fiction

Tor H. Nilsen

OCLC:70521676

Geological Society of America / David M. Miller / Tor H. Nilsen / William L. Bilodeau

OCLC:1120927995

Geology

OCLC:994050901