I will be concentrating on book and movie related items.
Book titles:
My Father’s Dragon (エルマーのぼうけん “Elmer’s Adventure”)
Elmer and the Dragon (エルマーとりゅう “Elmer and the Dragon”)
The Dragons of Blueland (エルマーと16ぴきのりゅう “Elmer and the 16 Dragons”)
Movie Merchandise:
Poster
Pencil Board (下敷き)
Pamphlet (パンフレット)
Flyer (チラシ)
Flyer (チラシ)
Flyer (チラシ)
Postcards
Stickers
Puzzles
Poster
VHS Tape
Soundtrack CD
Tote Bags (トートバック)
Hankerchief (ハンカチ)
Plush keychain
Backpack, plush Boris keychain, plush Elmer
Pin
Cels
Settei (設定)
Book:
Sugoroku (すごろく) board game
Karuta
Playing Cards (トランプ)
The Woman Who Wrote My Father’s Dragon Ruth Stiles Gannett(「エルマーのぼうけん」をかいた女性 ルース・S・ガネット) Book
Stickers
T-Shirt
Sources: