Heat Exhaustion and Heatstroke
[American Academy of Family Physicians (FamilyDoctor.org)]
First Aid for Heat Exhaustion
[Logical Images (via MedlinePlus)]
Tips for older adults to combat heat-related illnesses
[National Institute on Aging]
Dehydration
[Mayo Clinic]
Heat Injury (focus on athletics)
[American Academy of Orthopaedic Surgeons]
Preparing For and Playing In the Heat
[American College of Sports Medicine]