What has the author O B Gregory written?

Answer 1

O. B. Gregory has written:

'Sheep farmers'

'Airline pilots'

'Essentials of verbal reasoning'

'War against disease' -- subject(s): Disease

'Practise your spelling'

'Lumberjacks'

'First English workbooks'

'Bus drivers'

'Robert Clive'

'First steps to language'

Answer 2

W. W. Gregory has written:

'A revised check-list of the butterflies and skippers of Canada (Lepidoptera)' -- subject(s): Butterflies, Hesperiidae, Lepidoptera

Answer 3

O B Gregory is known for writing the fantasy novel "A Midwinter Sellsword."