What has the author Jacob Ray Gregg written?

Answer 1

Jacob Ray Gregg has written:

'Pioneer days in Malheur County'

'A history of the Oregon trail' -- subject(s): History, Oregon National Historic Trail, Overland journeys to the Pacific

'A history of the Oregon Trail, Santa Fe Trail, and other trails' -- subject(s): History, Overland journeys to the Pacific

Answer 2

Algar Robert Gregg has written:

'British Honduras. --'