CAMSCO has several of the recordings that were the basis of the book, though not all.
Here's what's available: ($18 US +S&H)

FTRAX-013 - As I Roved Out
Songs Of Courtship
FTRAX-015 - A Blacksmith Courted Me
Songs Of False Love & True
FTRAX-019 - The Bald-Headed End Of The Broom
Songs Of Uneasy Wedlock
FTRAX-035 - Ratcliffe Highway
FTRAX-040 - The Foggy Dew
Suffolk & Essex Singers
FTRAX-047 - Stormy Weather, Boys
Bob Roberts - Songs & Stories
FTRAX-053 - Harps And Hornpipes
Nansi Richards & Gypsy Woods
FTRAX 056 - The Bramble Briar
The Ballads Of Britain - With Pioneer Folksinger, Albert Lloyd
FTRAX-062 - The Licht Bob's Lassie
Isabel Sutherland
FTRAX-067 - What A Voice
Jeannie Robertson
FTRAX-071 - The Jug Of Punch
The McPeake Family Trio
FTRAX-097 - Up To The Rigs
Songs & Stories From Charlie Wills - Dorset Shepherd
FTRAX-098 - Jacky Boy-Master
Two Midland Folk-Singers - Sam Bennett & Cecilia Costello
FTRAX-124 - Wind Instrumentals
Bob Rundle & Tony Franklin
FTRAX-126 - Crawling Into Work
Dave Dodds & Curate's Egg
FTRAX-135 - Unto Brigg Fair
Grainger, Delius, Sharp & Taylor
FTRAX-141 - A-Roving
Archive Shanties & Sea Songs -1- The James Madison Carpenter Collection
FTRAX-142 - The Hog's Eye Man
Archive Shanties & Sea Songs -2-The James Madison Carpenter Collection
FTRAX-157 - Not A Word Of No Surrender
Robert Cinnamond -1-
FTRAX-158 - Fly Up, My Cock
Robert Cinnamond -2-
FTRAX-159 - The Rambling Youth
Robert Cinnamond -3-
FTRAX-161 - The May Morning Dew
Annie Jane Kelly & Sarah Makem
FTRAX-163 - The Mountain Streams
Brigid & Paddy Tunney & Mick Gallagher
FTRAX-164 - A Man In Love Feels No Cold
Paddy Tunney
FTRAX-175 - The Rosin Box
John Reilly- Sings Irish Tinker Ballads
FTRAX-186 - Davie Faa
Jeannie Robertson - The Big Ballads
FTRAX-187 - Tales From A Traveller
Jeannie Robertson
FTRAX-189 - The Great Silkie
Songs From The Orkneys
FTRAX-208 - Maggie, Maggie May
Bob Roberts Sea Songs & Shanties
FTRAX-219 - Bottoms Up
Songs Miss Pringle Never Taught Us - Frank Purslow & John Pearse
FTRAX-301 - Diddle-Daddle
Mouth Music Of Britain & Ireland
FTRAX-365 - It Fell On A Day
Lucy Stewart – Balladsinger
FTRAX-418 - Lower Your Funnel
Music Of The Canals & Waterways
FTRAX 432 - Wild Rover No More
Songs From Fermanagh & Tyrone
FTRAX 435 - Slieve Gallon Brae
Voices Raised In Ulster
FTRAX-511 - A-Mining We Will Go
Songs Of Coal, Iron, Steel & Tin
FTRAX-512 - Blow The Winds-I-O
Songs Of Storm & Shipwreck
FTRAX-513 - Come All Ye Seamen Bold
Songs Of The Fighting Sailor
FTRAX-514 - The Broken Token
Sailors And Their Sweethearts
FTRAX-515 - The Boatie Rows
Coastal Songs & Forebitters
FTRAX 516 - The Deadly Wars
Songs Of Barrack & Battlefield
FTRAX-517 - Bloody Waterloo
Napoleon - Songs, Marches & A Mummers Play
FTRAX-518 - The White Cockade
Soldiers & Their Sweethearts
FTRAX-901 - Listen To America Sing
Frank Warner & Family In Concert
FTRAX-907 - Black Is The Colour
Maud Karpeles Appalachian Collection -1- 1950-1955
FTRAX-908 - Cumberland Gap
Maud's Appalachian Collection -2-
FTRAX-915 - The Wife Of Usher's Well
Jean Jenkins -2- Mountain Ballads
FTRAX-921 - Paddle The Road With Me
Yankee John Galusha
FTRAX-922 - Whisky In The Jar
Lena Bourne Fish
FTRAX-926 - Barbaree
Songs From The Outer Banks
FTRAX-931 - Bolamkin
Frank Proffitt -1-
FTRAX-932 - John Hardy
Frank Proffitt -2-
FTRAX-933 - I'm Going Back To North Carolina
Frank Proffitt - Vol 3