A lot of 6 collectible books. 
Full title on books is: 
The Observer's Book of Aircraft, there are 6 editions available, please note each edition was printed in that year with new updated info and pictures. 
The editions we have are as follows:
1960, 1961, 1962, 1963, 1964 and 1967. 
These books are very hard to find in the US as they were printed in London and are primarily available in Europe. These are smaller books, probably made to fit into the palm of a hand. 

We are a “Friends of the Library” bookstore; please look at all pictures so you know exactly what you are buying. Thank you for taking the time to look please be sure to look at our Ebay bookstore. We would be happy to answer any questions you may have about any of our books.