There are 3 books in the Montana Trilogy series. The newest book is Ride with Me, Mariah Montana which came out in 1990.

1
English Creek

English Creek
The events of summer, 1939, in Two Counties, Montana--the herding of sheep onto the summer range and the rodeo, picnic, and square dance on the Fourth of July counterpoint the coming of age of Jick McCaskell
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The central volume in Ivan Doig's acclaimed Montana trilogy, Dancing at the Rascal Fair is an authentic saga of the American experience at the turn of this century and a passionate, portrayal of the immigrants who dared to try new lives in the imposing Rocky Mountains.

Ivan Doig's supple tale…

3
Ride with Me, Mariah Montana

Ride with Me, Mariah Montana
The tale of a family of Scottish immigrants to Montana follows Jick McCaskill and his daughter Mariah on a tour through the state in the summer of its centennial year