Maps are contained in this book is the correct passive.
Contain is a regular verb.
Contained is the second and third form of contain.
Present Indefinite Tense
Active Voice: Subject + Verb + Object
Passive Voice: Object + is/am/are+ third form of a verb + by + subject.
The “At” is used when you are at the top, bottom or end of something.
The house is at the end of the street.
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