According to WorldCat, that book is held by 87 libraries in the United States. Since they all seem to be public libraries, I can't seem to find an LC call number. The one I came up with for you is PS3620.A24 so all of your books would begin with that and then have another number at the end to represent the title, such as S5 for "singing" or P6 for "postcards"

I could talk about call numbers all day!