This is a Whitman Book. It states this on the top left of the cover and also on the spine. It has the title "Lassie - Trouble at Panter's Lake", a picture of Lassie, and "by Steve Frazee" on the front cover that is in full color and printed. Also on the spine it has "1515" the item number along with the title and "Frazee". It never had a dust jacket. This book is 7-5/8" tall x just under 5-1/4" wide x just over 3/4" thick. It has 210 pages. It is "Copyright - copyright symbol - 1972 by Wrather Corporation". It also states "A Whitman Book - Western Publishing Company, Inc. - Racine, Wisconsin". It does have some slate colored prints. But it is a chapter book for older children and most pages do not have pictures.
This book does have some edge nicks and bends to the corners. The pages have yellowed. As can be seen in the last picture, the original owner signed her name in pencil. I did not try to remove it.