I did have three of them for some reason when I was a lot younger. One called The Observer's Book of British Birds, the other two just The Observer's Book of Birds. Only got one now, 30th edition (1958). By S. Vere Benson, Hon. Sec. of the Bird-Lovers' League (what happened to that, I wonder).
Interesting choice of species in it: no Collared Dove or Little Egret, of course, no Osprey, no Mandarin; and only one 'Crossbill'. White Wagtail and Blue-headed Wagtail each get a page of their own. Very few scarcities chosen, but they do include Red-spotted Bluethroat, Red-breasted Flycatcher, 'White-tailed or Sea-Eagle', Rough-legged Buzzard, Little Bittern, and Kentish Plover 'nesting only on a small piece of south coast'.