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The Disperity catalog
4 books
Puzzles & Activities
100 Beginner-Friendly Cryptogram Puzzles
By Ethan H. Arlen
Decode a note, notice a detail and spend a little time on Willow Lane. One hundred original cryptograms follow thirty small neighborhood cases, with recurring characters, a fresh key for each puzzle and as much help as you want.
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Puzzles & activities
Large-Print Nostalgia Word Searches for Adults and Seniors
By Ethan H. Arlen
Large-print nostalgia word searches for adults and seniors: 56 everyday-life puzzles, no backward words, optional memory questions and full-size printed solutions. Try actual pages before choosing a puzzle gift.
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Technology & professional education
Economics, Resilience, Operations and Practice
By Ethan H. Arlen
Practice cost decisions, migration sequencing, recovery, observability and automation. Twelve chapters include integrated cases and 264 original questions, including two 75-question practice exams with explanations.
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Technology & professional education
Architecture, Data, AI and Security
By Ethan H. Arlen
Build the reasoning behind cloud-native systems, hybrid networking, data platforms, AI applications, identity and tenant isolation. Thirteen chapters connect worked trade-offs, diagrams and 134 original questions with answer explanations.
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