Alice Crew Gall and Fleming H. Crew

Of their work, the Mrs. Gall and Mr. Crew wrote, "We are brother and sister.... Like most boys and girls, we loved the out-of-doors and were fond of taking hikes into the nearby woods and fields or along the banks of the small streams that flow down to the river.... It was on these hikes that we learned to know the small wild creatures [and] learned to love them too. [We] decided that it would be fun to write about them. And it has been fun, even more fun than we thought. For each book...has arried us back in memory to the time when, as children, we saw these creatures making their nests and burrows and living their lives...."
(From The Junior Book of Authors, Second Edition, Kunitz and Haycraft.)

Nature Novels
Bushy Tail* (chipmunk)
Flat Tail* (beaver)
Little Black Ant*
Ringtail* (raccoon)
Splasher* (muskrat)
Wagtail* (tadpole/frog)

Mother McGrew books. I have never owned one of these short picture books, but you can read Tommy Turkey online. These are very different from the nature novels produced by these authors.
Mother McGrew and Bartholomew Bull Frog
Mother McGrew and Cordelia Clam
Mother McGrew and Daniel Donkey
Mother McGrew and Gerald Giraffe
Mother McGrew and Kate Kangaroo
Mother McGrew and Oliver Owl
Mother McGrew and Susanna Snail
Mother McGrew and William Woodpecker

Other Stories
The Adventures of Toby Spaniel* (?)
All Around The Year
All the Year Round* (I believe that this may be identical to the above book.)
Can You Read It? (rebus, LOC)
Each in His Way, Stories of Famous Animals* (Illustrated by Kurt Wiese.)
The Good Child's Story Book
Here and There and Everywhere* (Short nature stories, illustrated by Nils Hogner.)
In Peace and War: a Story of Human Service* (About the Red Cross; may also have been subtitled "The History of the Red Cross.")
In Peace and War: the History of the Red Cross.
Mary and Her Kitchen Garden (LOC)
More the Merrier, Stories
Royal Mimkin*
Top of the World*
Winter Flight* (Illustrated by Nils Hogner.)