There are several game variations in the rule book, Crossword Lexicon, Lexicon, and Lexicon Solitaire.
Quoted from the Rules for Crossword Lexicon, Copyright 1937, Parker Brothers, Inc. ... "Each player, by playing his cards to the Crossword layout in the center of the table, tries to play out their whole hand before any other player succeeds in doing so. Cards left in players' hands at the end of play in each deal are counted against them and the low score wins the game. As soon as one player reaches 100 points, the game ends and the player with the lowest score wins.
The player at the left of the dealer starts by placing any word of not less than two or more than four letters in the center of the table, naming the words as they play it. After the first player, all following must play to the words already formed on the table. If the first player (or any subsequent player) cannot form a complete word, they discard one card from their hand and take in exchange either the exposed card, or the top Blind card, from one of the piles on the table. Before taking from the Blind pile, the player must always discard first."
There are several game variations in the rule book, Crossword Lexicon, Lexicon, Lexicon Solitaire and several different options for these card games that can be played with this deck.
Also, at the bottom of one of the pages is, ...
"A double set of Crossword LEXICON is made containing two complete packs with Red and Blue backs respectively. Price $1.00"
(Remember the year, 1937, a buck was a lot of money back then, at least I have been told.)
Deck has 54 cards: A-4 B-1 C-2 D-1 E-5 F-1 G-2 H-2 I-3 J-1 K-1 L-3 M-2 N-2 O-3 P-1 Q-1 R-3 S-3 T-3 U-2 V-1 W-2 X-1 Y-1 Z-1 Master-2