The episodes on these DVDs are...

Arthur Stands Up To Bullying
"The Last Tough Customer / Brain's Chess Mess" (16-6)
"So Funny I Forgot to Laugh / The Best Day Ever" (16-10)

Arthur's Music Jamboree
"Arthur Plays the Blues / Buster's Sweet Success" (6-2)
"My Music Rules / That's a Baby Show!" (4-10)
"Arthur vs. the Piano / The Big Blow-Up" (2-8)
"Muffy's Soccer Shocker / Brother, Can You Spare a Clarinet?" (6-4)

Hooray For Health
"Arthur's Chicken Pox / Sick as a Dog" (1-18)
"Arthur's Tooth / D.W. Gets Lost" (1-24)
"D.W. the Picky Eater / Buster and the Daredevils" (2-3)
"Just Desserts / The Big Dig" (5-9)

Arthur's Travel Adventures (not "Outdoor")
"D.W. Goes to Washington / Arthur's Mystery Envelope" (2-10)
"Arthur Goes to Camp / Buster Makes the Grade" (1-7)
"Arthur's Family Vacation / Grandpa Dave's Old Country Farm" (1-15)
"It's a No-Brainer / The Shore Thing" (5-3)

The "Perfect Christmas" DVD has only said episode with no other episodes. I remember both it and a VHS were advertised on PBS after it was broadcast many years ago.