Ajami's book is an indispensable guide to why anyone in the Arab world still listens to it.

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This handbook remains an indispensable guide because of the general details it provides for each species.

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These works are all indispensable guides to the city's "secret history," and their absence is palpable here.

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Bush's navigation skills and knowledge of the western region, gained during his years as a trapper, made him the indispensable guide of the party.

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