his first book, "Wandering Under Sail", describes single handed cruising around the southern and western coasts of Britain in the later 1930's; it has been reprinted.
His second ir rare; it is called "I left the Navy" and describes his wartime experiences; it is a favourite of mine but nothing to do with sailing.
The book that made his name is "Cruising Under Sail" published in 1950, reprinted a couple of times, which really replaced Claud Worth's "Yacht Cruising" (1911) and was the Bible for a couple of generations of people taking up sailing.
There is a companion volume, "Voyaging under Sail" which covers blue water passagemaking and was the Bible of that in its turn.
These two were re-isued in a shortened combined single volume, not very happily I think; you are better prowling the secondhand bookshops for the real things.
"Around the World in Wanderer 111", "Beyond the West Horizon" and the others are accounts of voyages made by the Hiscocks and frankly these are now dated, I feel, in a way that the "how to" books, oddly, are not.
I bought both Cruising and Voyaging at the Thames rally a couple of weeks ago for £14 each. Both are particularly valuable if you have a boat of the 50s-60s era, as I do, because they are written for those vessels. I met the Hiscocks when they came to NZ on their second voyage in 1961 and our family became good friends. More than anybody, perhaps, through his books Eric inspired a whole generation of sailors to go blue water, as I did in fact. Much can be gleaned from the books about their own voyages. On one trip they got a terrible pasting in a cyclone between Tonga and New Zealand. Instead of heading for the nearest hot shower and restaurant, as I'm sure the rest of us would have done, they sailed into a deserted cove where they washed up, dried out, did some varnishing, then sailed on into Auckland with all flags flying and got clearance. That was style!
If you really want to get hold of any second-hand/out of print books then a visit to www.abebooks.com is to be recommended. Or not, depending on your wallet and degree of self control.
I reckon Sou'west in Wander IV is worth a read. If only to put you off getting a boat bigger than you need.