Sources and original illustrations

Primary references and the limits of this educational collection.

Primary references

• National Park Service — Indiana Dunes: directions — Separate park destinations, visitor-center approach and official facility maps.
• National Park Service — Cuyahoga Valley: directions — Boston Mill Visitor Center, Cleveland and Akron approaches and location-specific addresses.
• National Park Service — Mammoth Cave: directions and transportation — South-side visitor services, the Green River division and navigation limitations.
• National Park Service — Ste. Genevieve: directions — Town approach, historic-house locations and oversize-vehicle routing.
• National Park Service — Valley Forge: directions and transportation — Main entrance, visitor-center arrival and vehicle-specific limitations.
• National Park Service — Minute Man: directions and transportation — Separate park units and distinct visitor-center and North Bridge destinations.
• National Park Service — Delaware Water Gap: directions — Long park geography and separate Pennsylvania and New Jersey road corridors.
• National Park Service — Shenandoah: directions — Four public entrances, Skyline Drive and the distinction from boundary service roads.
• National Park Service — Congaree: directions — Harry Hampton arrival, vehicle parking limits and prohibition on sleeping in vehicles.
• National Park Service — De Soto: directions — Bradenton road approach and the memorial road terminus.
• National Park Service — Biscayne: directions — Mainland Dante Fascell Visitor Center approach in Homestead.
• National Park Service — Lyndon B. Johnson: directions — Separate Johnson City and Stonewall visitor areas.
• National Park Service — Florissant Fossil Beds: basic information — Colorado Springs proximity, protected fossils, exhibits and short interpretive options.
• National Park Service — Tonto: directions — Highway 188 approaches; dated page is not evidence of current scenic-road status.
• National Park Service — Saguaro: directions and transportation — Separate east and west districts and exact physical destinations.
• National Park Service — Lake Mead: directions and transportation — Multiple entrances, paved and backcountry road distinction and desert travel context.
• National Park Service — Ebey’s Landing: directions — Whidbey Island bridge and ferry approaches and public/private-land map context.
• National Park Service — Fort Vancouver: directions and transportation — Vancouver facilities and the separate McLoughlin House in Oregon City.
• National Park Service — Point Reyes: directions and transportation — Bear Valley arrival, separate destination directions and winding approaches.
• National Park Service — Biscayne visit planning — Predominantly water-based park geography; separate mainland arrival from an on-water experience.
• National Park Service — Tonto visit planning — Different access and physical requirements for the visitor center and cliff-dwelling visits.
• National Park Service — Getting around Saguaro — Different named scenic drives and vehicle-size constraints in the two districts.
• NPS — Fort Matanzas accessibility — The distinction between accessible arrival facilities and the fort’s stepped access, plus the park’s virtual-tour alternative. Confirm current conditions directly for individual needs.
• NPS — Fort Matanzas directions — The monument’s separate location south of St. Augustine; this article supplies no promised driving time.

Original visual material

The diagrams in this edition are original SVG illustrations explaining the sequence or decisions in each guide. They do not show a laboratory experiment, a personal trip or a tested product result. No photographs from the linked sources are reproduced.

Check the source in context

References were consulted during preparation of this edition. A source may cover a broader or narrower question than a particular guide; the support notes above explain why it is listed. Read the original for methodology, exceptions and updates.