Books like The Secret Valley
Clyde Robert Bulla, Grace Paull
The Secret Valley is 106 pages, about 1 hour 57 minutes at 250 words a minute.
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How long each takes
Seeds of Hope 3.3 h 
White Fang 4.4 h 
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The Call of the Wild 4.4 h 
Lando 2.9 h 
Blue Willow 3.2 h 
Bandit's Moon 2.5 h 
Little House on the Prairie 5.7 h 
By The Great Horn Spoon 3.5 h 
Farmer Boy 6.8 h 
Swallowing Stones 4.5 h 
Vengeance Road 6.1 h Bar height shows length. Estimated at 250 words a minute.