Sometime between 1970 and 1974 my parents purchased a nature book series for me that was mailed to our house once per month (or perhaps bi-monthly). It was for kids and contained different themes in each book. I think there might have been 10 or 12 books in the entire series (but I’m not sure).
I distinctly remember the first book’s title (or theme) was called: Tracks & Trails.
I’m trying to locate this book series (or at least this first book in the series.