1st Printing: The first printing is highly sought after by collectors and thus more valuable.
It has the TSR lizard man logo on the cover. There's no printing information given on the first page.
(see picture above).
2nd to 4th Printing: The second printing has the TSR lizard man logo on the cover.
The distinguishing printing information is given on the first page of the booklet.
5th/6th printings: The 5th and 6th printing and possible later printings feature the TSR wizard logo. The distinguishing printing information is given on the first page of the booklet.