They are available on Kindle but are not cheap ($11-12 each) and the first book is "The Breaking of Northwall" "The Dome in the Forest" is book 3. There seems to be 7 in total.
Having suffered a stroke several years ago that makes brain "jump" around a bit. Saw a map, and thaught aboit a doom in the forrest, Pelbar also surfaced. Have anyone read these books from late 70s and in to the 80s, read 1 book, the dome in the forrest, dont remember much, more than its in the US several 100 years after our civilizations fall... Should I pick them up again?