Billy Anderson, whose 35-year-old son, Jason, of Midfield, Texas, died in the blast, recalled the trauma of watching the disaster play out on television.

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Among these free resources are a series of general information sheets on specific types of blast injury developed together with the American Trauma Society.

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"All I feel is joy, " said Dr. George Velmahos, chief of trauma surgery at Massachusetts General Hospital, referring to his hospital's 31 blast patients.

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George Velmahos, chief of trauma surgery at Massachusetts General Hospital, where many of the wounded were taken, said some had blast wounds "as well as small metallic fragments that entered their body - pellets, shrapnel, nails".

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