Kristina Callahan

• Vampire Attack
• 3 Puppy Stories
• Celine
• Condition of Vegetation Communities in Allegheny Portage Railroad National Historic Site and Johnstown Flood National Memorial
• Detective Michael Comic
• Grey Faction - Arrival of the Grey Queen (2nd Edition)
• Integrity of Benthic Macroinvertebrate Communities in Allegheny Portage Railroad National Historic Site and Johnstown Flood National Memorial
• Riverside Mystery
• Scalpel and the Hunt
• Scalpel Murder Comic - Volume 1
• Taking a Dark Turn
• Wadeable Stream Monitoring in Allegheny Portage Railroad National Historic Site, Delaware Water Gap National Recreation Area, Johnstown Flood National Memorial, and Upper Delaware Scenic and Recreational River