These books were either stored in my mom's home or stored by me in my own home. There are varying degrees of wear so I will list them each here. Most do show some signs of wear on the cover edges top and bottom and maybe a little dusty. Some of the books have blue on the edges others are all white. There may some staining on the edges of the books. I posted a picture of one set nothing is worse than what you see there. Most of the outer edge bindings are creased, if the inside is going bad I posted it under the title. 
These were well loved books when I was younger and they got a lot use being taken on and off the bookshelf.
I will post as many pictures of the issues as possible. I have tried to list all that I see with the books. I might have missed a few of the prices that were written inside the covers most of which were done in pencil

Book 1   1959 - The Tower Treasure - There are some stains in the beginning of the book. The binding is in good condition. 
Book 2   1959 - The House on the Cliff - This one is a more worn than most of the rest. There is also a place in the front that looks
                                 like there was a sticker. The binding is starting to break and the pages are offset. I must've really liked this one.
Book 3   1962   The Secret of the Old Mill - This one is in decent condition. 
Book 4   1962   The Missing Chums - This one is also in decent condition. 
Book 5   1963   Hunting for Hidden Gold - This one is good condition. 
Book 6   1964   The Shore Road Mystery - There is a small tear on the back cover. Otherwise, it is in good condition.
Book 7   1964   The Secret of the Caves - The binding on the inside cover is starting to crack. Other than that the book is decent 
                                   condition.
Book 8   1966   The Mystery of Cabin Island - This one is in good condition.
Book 9   1965   The Great Airport Mystery - This one is good condition, there is one dog eared page
Book 10 1967   What Happened at Midnight - This one is in good condition
Book 11 1962   While the Clock Ticked - This one is in decent condition
Book 12 1965   Footprints Under the Window - There is a piece of tape stuck to the inside front blank page. Other than that this
                                 book is in good condition.
Book 13 1967   The Mark on the door - This one is in good condition
Book 14 1961   The Hidden Harbor Mystery - This was definitely one of my favorites. The binding is starting to show signs of 
                                loosening. I also colored in a few things on the inside front cover and marked off which books I already had. 
Book 15 1968   The Sinister SignPost - This one is in good condition.
Book 16 1965   A Figure in Hiding - This one is good condition.
Book 17 1966   The Secret Warning - This one is in good condition.
Book 18 1969   The Twisted Claw - This one has writing in the front, it was apparently a gift to someone, The book itself is in good 
                                condition.
Book 19 1964   The Disappearing Floor - This one is in good condition.
Book 20 1970   Mystery of the Flying Express - This one is in good condition
Book 21 1942   The Clue of the Broken Blade -  The top corner edge is tattered, there is a price in pencil on the inside cover and 
                                 some marker marks in the front as well.
Book 22 1971   The Flickering Torch Mystery - The book is in good condition. There is some odd discoloration inside the front and 
                                 back cover and first few pages. I am not sure if the was intentional or maybe a printing issue..There is also a  
                                 penciled in price inside the cover,
Book 23 1944    The Melted Coins - This book is in decent condition. The binding is starting to come apart.
Book 25 1969    The Secret Panel - There is a price penciled in on the inside cover. It is in good condition.
Book 31 1962    The Secret of Wildcat Swamp - This one is in good condition.
Book 37 1966    The Ghost at Skeleton Rock -  The binding is starting to crack in the beginning of the book.
Book 38 1959    The Mystery Devil's Paw -  There is a price written inside the front cover. The binding is showing signs of starting 
                                 to crack.
Book 40 1961    Mystery of the Desert Giant - This one is in decent condition
Book 41 1962    The Clue of the Screeching Owl - This one has a written 'gift' note in the front as well as price on the inside
                                front cover.Ohtherwise it is in decent condition.
Book 46 1967     The Secret Agent on Flight 101 - This one is in decent condition. The back cover as the 'other titles' marked out. 
Book 48 1969    The Arctic Patrol Mystery - There is a price on the inside cover. The binding is starting to loosen up.
Book 51 1972    The Masked Monkey - This one is good condition.
Book 53 1974    The Clue of the Hissing Serpent - This one is in good condition.


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