: Which leads to my question..... Does anyone know which books were published in the UK and which ones are US only?

Actually there are a few Norton titles that were only published in the UK. If you come across ISLAND OF THE LOST please let me know & I'll help finance the rest of your purchases.

Please feel free to contact me directly. I have the addresses of a couple of UK book dealers.

I was going to answer that most of Andre Norton's books were reprinted in the UK. I just spent the time going through my list
Here's what I come up with.
Published/Reprinted in the UK
UK
PRINCE COMMANDS
RALESTON LUCK
SWORD IS DRAWN
SCARFACE
SWORD IN SHEATH
STAR MAN'S SON
STAR RANGERS
MURDERS FOR SALE (by Weston)
SARGASSO OF SPACE
STAR GUARD
PLAGUE SHIP
CROSSROADS OF TIME
STAR BORN
SEA SIEGE
STAR GATE
BEAST MASTER
SECRET OF THE LOST RACE
SIOUX SPACEMAN
SHADOW HAWK
CATSEYE
LORD OF THUNDER
WITCH WORLD
JUDGMENT ON JANUS
WEB OF THE WITCH WORLD
NIGHT OF MASKS
THREE AGAINST THE WW
QUEST CROSSTIME (as CROSSTIME AGENT)
X FACTOR
STEEL MAGIC
YEAR OF THE UNICORN
MOON OF THREE RINGS
VICTORY ON JANUS
OCTAGON MAGIC
WARLOCK OF THE WITCH WRLD
ZERO STONE
DARK PIPER
SORCERESS OF THE WITCH WORLD
UNCHARTERED STARS
POSTMARKED THE STARS
BERTIE AND MAY
ICE CROWN
DREAD COMPANION
EXILES OF THE STARS
ANDROID AT ARMS
BREED TO COME
DRAGON MAGIC
SPELL OF THE WITCH WORLD
CRYSTAL GRYPHON
FORERUNNER FORAY
IRON CAGE
JARGOON PARD
OUTSIDE
NO NIGHT WITHOUT STARS
KNAVE OF DREAMS
STAR KA'AT
WRAITHS OF TIME
RED HART MAGIC
TREY OF SWORDS
STAR KA'AT WORLD
STAR KA'ATS & PLANT PEOPLE
IRON BUTTERFLIES
FLIGHT IN YIKTOR
BLACK TRILLIUM
ELVENBANE (w/M. Lackey)
MARK OF THE CAT
ELVENBLOOD (w/M. Lackey)
************************************************
I have no record of the following being printed in the UK
FOLLOW THE DRUM
ROGUE REYNARD
HUON OF THE HORN
AT SWORD'S POINTS
STARS ARE OURS!
YANKEE PRIVATEER
STAND TO HORSE
TIME TRADERS
VOODOO PLANET
GALACTIC DERELICT
STORM OVER WARLOCK
RIDE PROUD, REBEL!
STAR HUNTER
DEFIANT AGENTS
EYE OF THE MONSTER
REBEL SPURS
KEY OUT OF TIME
ORDEAL IN OTHERWHERE
OPERATION TIME SEARCH
FUR MAGIC
HIGH SORCERY
GARAN THE ETERNAL
HERE ABIDE MONSTERS
LAVENDER GREEN MAGIC
DAY OF THE NESS (w/Gilbert)
WHITE JADE FOX
MERLIN'S MIRROR
MANY WORLDS OF A. NORTON
PERILOUS DREAMS
VELVET SHADOWS
OPAL EYED FAN
QUAG KEEP
YURTH BURDEN
ZARSTHOR'S BANE
SEVEN SPELLS TO SUNDAY (w/Miller)
SNOW SHADOW
LORE OF THE WITCH WORLD
VOORLOPER
MAID AT ARMS
GRYPHON IN GLORY
FORERUNNER
HORN CROWN
TEN MILE TREASURE
STAR KA'ATS & WINGED WRRS
MOON CALLED
CAROLINE
WHEEL OF STARS
BALEFUL BEASTS & EERIE...(ed.?)
BOOK OF ANDRE NORTON
BROTHER TO SHADOWS
BULLARD OF THE SPACE Patrol
CATFANTASTIC (w/Greenberg ed.)
CATFANTASTIC 2 (w/Greenberg ed.)
CATFANTASTIC 3 (w/Greenberg ed.)
CATFANTASTIC 4 (w/Greenberg ed.)
CATFANTASTIC 5 (w/Greenberg ed.)
CIARA'S SONG
CROSSROADS OF TIME
DARE TO GO A-HUNTING
DERELICT FOR TRADE (w/Smith)
ECHOS IN TIME (w/Smith)
EMPIRE OF THE EAGLE (w/Shwartz)
FIRE HAND (w/Griffin)
FLIGHT OF VENGANCE (w/Griffin &)
FORERUNNER: 2ND VENTURE
FOUR OF THE WITCH WORLD (ed.)
GATE OF THE CAT
GATES TO TOMORROW (w/Donly ed.)
GOLDEN TRILLIUM
GRAND MASTERS (w/Ziehut eds.)
GRYPHON'S EYRIE (w/Crispin)
HANDS OF LYR
HOUSE OF SHADOWS (w/Miller)
IMPERIAL LADY (w/Shwartz)
JEKYLL LEGACY (w/Bloch)
KEY OF THE KEPLIAN (w/McConchie)
LAST PLANET
MAGESTONE (w/Schaub)
MAGIC IN ITHKAR
MAGIC IN ITHKAR 2
MAGIC IN ITHKAR 3
MAGIC IN ITHKAR 4
MANY WORLDS OF A. NORTON
MIND FOR TRADE (w/ Smith)
MIRROR OF DESTINY
MONSTER'S LEGACY
MOON MIRROR
ON WINGS OF MAGIC (w/ Mathews &)
REDLINE THE STARS (w/Griffin)
RIDE THE GREEN DRAGON (w/Miller)
SCENT OF MAGIC
SERPENT'S TOOTH
SHADOW OF ALBION (w/Edgehill)
SMALL SHADOWS CREEP (ed.)
SONGSMITH (w/Crispin)
SPACE ADVENTURE NOVELS
SPACE PIONEERS
SPACE POLICE
SPACE SERVICE
STAND AND DELIVER
STORMS OF VICTORY (w/Griffin)
TALES OF THE WITCH WRLD (ed.)
TALES OF THE WITCH WRLD 2(ed.)
TALES OF THE WITCH WRLD 3(ed.)
TIGER BURNING BRIGHT (MZB&)
WARDING OF THE WITCH WORLD
'WARE HAWK
WERE-WRATH
WIND IN THE STONE
WITCH WORLD: STORMS OF VICTORY
WIZARDS' WORLDS