Princeton Review AP Environmental Science Premium Prep, 20th Edition

• Study with prep and practice written entirely by AP educators
• Learn test-taking strategies for multiple-choice and free-response questions, backed by 40+ years of test prep success 
• Focused, supportive lessons designed and perfected by experts

• A step-by-step guide on how to better your score with this book
• Comprehensive review of all topics on the new digital exam
• Customize a study plan and target areas of improvement by using our diagnostic answer key
• Detailed figures, graphs, and charts to illustrate important world environmental phenomena
• End-of-chapter drills and exclusive online digital flashcards to reinforce learning

• 4 full-length practice tests (3 in the book, 1 online)
• Detailed answer explanations to help you learn from mistakes
• Online tests provided as both digital versions (with timer option to simulate exam experience), and as downloadable PDFs (with interactive elements mimicking the exam interface)
• Quick-study glossary of the terms you should know
• Get more via your online student tools—including a list of key terms and concepts, study plans, and exam updates

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Standard and Primary covers are widely available through general retailers. They often have higher print runs and can be cheaper, especially during sales.

In contrast, Direct Market (DM) and variant covers are primarily sold in comic shops. DM editions tend to have more limited availability and may be more valuable to collectors.

The main differences lie in artwork style, availability, price, and collector appeal. Ultimately, the choice between standard and variant covers depends on personal preference, budget, and individual collecting goals.

Comic book enthusiasts have various formats to choose from when collecting their favorite stories.
Here's a brief overview of the main types:

Omnibus

• Large, hardcover collections
• Usually contain complete runs or extensive story arcs
• Typically 800-1000+ pages
• Higher price point, often €100-€150

Oversized Hardcover (OHC)

• Similar dimensions to omnibus, but thinner
• Collect shorter runs or story arcs
• Usually 300-600 pages
• Priced between €30-€50

Hardcover (HC)

• Standard-sized hardcover books
• Collect 6-12 issues typically
• Similar dimensions to single issues, but with a hard cover
• Priced around €25-€35

Trade Paperback (TP)

• Softcover collections
• Standard comic book size
• Usually collect 4-6 issues
• Most affordable option, typically €15-€25

Other Formats

• Absolute Editions: Oversized, deluxe hardcovers (mainly DC Comics)
• Compendiums: Massive paperback collections
• Graphic Novels (OGN/GN): Original stories not previously released as single issues

The choice between these formats often depends on personal preference, budget, and collecting goals. Omnibus and OHC editions offer larger artwork and more content but at a higher price, while TPs provide a more affordable way to collect complete story arcs