Wikipedia: 1939 City of San Francisco derailment

SFGATE: Sabotage killed dozens on the City of San Francisco

Great Basin College: Recalling a Train Wreck

Train Orders: "DERAILMENT AT HARNEY---1939

Newspapers.com: Train Derailment - San Francisco Examiner Archive

Nevada Appeal: 70 years later, train wreck's cause shrouded in mystery

Reno Gazette Journal: From 1939: 20 known dead in train wreck

Alamy: City of san francisco train Black & White Stock Photos

DBpedia: About: 1939 City of San Francisco derailment

Online Archive of California: Inventory of the City of San Francisco Derailment Collection

YouTube: City Of San Francisco Train Wreck Of 1939

The Washington Post: TALE OF A 1939 WRECK IS STUDIED FOR CLUES

Time Magazine: Transport: In Humboldt Canyon