As far as the sieges of Leningrad and Stalingrad, I think the public library should have a wealth of material. But those were situations that I think are very unlikely to happen in the US today, so some of the lessons learned are not likely to apply to even a massive, prolonged power failure.

Britain, during the war, turned pretty much every scrap of arable land into a farm, for example. The Soviets in Leningrad strictly rationed what little food they could get. During the winter, truck drivers were able to cross the frozen lake in convoys with food supplies; they kept this up around the clock despite constant attacks from the Luftwaffe, well into the Spring thaw; many drivers drowned when their trucks broke through the ice, and by the time they were forced to halt the deliveries, all the driver's side doors on all the trucks had simply been removed to make it easier to escape if the truck started going under.

None of this is likely to be of much help for individual planning.

My sister gave me a book that was put together by the Halifax Chronicle-Herald newspaper following Hurricane Juan's passage through Nova Scotia. As far as "survival" goes, not much in it except some interesting anecdotes. Many people who owned gas generators realised that it wasn't necessary to keep the freezer going 24 hours a day, for example, and set up a rotating schedule, toting their generator from neighbour to neighbour and running it for four hours at a time. (A large generator would power three household freezers; with a couple of long extension cords, they were able to keep 9 freezers going (for 4 hours out of every 12).

I'm sure many other communities which have lived through similar disasters have produced similar books which you may be able to get by asking at the public library.