Merck Manual

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Some common North American poisonous snakes (colors not true to life; please consult a guide for proper identification of any snake)
Some common North American poisonous snakes (colors not true to life; please consult a guide for proper identification of any snake)
Some common North American poisonous snakes (colors not true to life; please consult a guide for proper identification of any snake)
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Snakebite