I didn’t see any markings when I flipped through these books.  #1 and #2 are in very good condition for their age, especially #2 which is in phenomenal condition (published in 1950).  #3 shows more wear (see condition notes below), but is completely legible and usable.

 #1.  “Lovable Hand Knits: Infants to 4 Years” Bucilla/Bernhard Ulmann #30, 1968.  62 pages.  Color photos.  Lots of wonderful knits for babies and young children: baby sets; jackets; hooded cardigan and leggings set; 4 baby afghans; girl’s diamond cardigan; fair isle set with sweater or top, hat, shorts, and skirt with suspenders; many sweaters; several dresses and jumpers; cable pullover sweater, helmet hat, and mittens set; double-breasted jacket; slippers; girl’s coat and hat; MORE!  Complete instructions.  Most of the styles are classics that would look wonderful today.  Styles for boys, too.  Some cover wear.  Sound binding.

 #2.  “Bear Brand Baby Book: infants to 4 years” from Bear Brand #339, 1950.  55 pages.  Knit and crochet.  Many baby sets; afghans/blankets; snowsuit; bunting; many bonnets; lots of booties and mitts; sacques; many sweaters; crib cover with kitten design; coat and hat set; snow suit; cable vest; striped shirt; romper; cardigan with paper doll design; MORE!  In fantastic condition for its age (70+ years).

 #3.  “Very Young Fashions” from Spinnerin #169, 1966.  55 pages.  Color photos.  Styles to knit for babies through 6 years, for boys and girls.  Patterns include: baby bunting with hood; several baby sets; hat and sweater set; chunky shawl-collar jacket; bubble play suit; cardigans; girl’s coat; two sweaters with fair isle folk designs; MORE!  Covers show some wear; binding is sound.  Some pages show evidence of old water damage, but they turn easily and there is no odor or mold.  Completely legible.