52nd and 53rd printings known. No printing dates listed. Dates a guess based on series number.
On 52nd printing, ISBN is listed on copyright page and not on the cover. No last page Peanuts books for sale ad.
On 53rd printing, last page ad for Peanuts books is listed (listing series numbers starting with 23217 to 23065.
Per Book In Print, there was an unknown printing released in August 1981 with a 1.75 USD cover price. Since the 52nd and 53rd printings are known to be 1.25 USD there is likely to have been printings released between the two with a 1.50 USD cover price.