The creation of Lingenfelter's copy of the Declaration rendered the original virtually unreadable, however it produced an anastatic copy " for all historical purposes more important than the original" and "therefore, really portrays more truthfully what the Document was than the original itself.
Birch's described it as "an anastatic copy on parchment from the original.
The anastatic process produced a perfect likeness of the original using an acid-based solution, which occasionally damaged or destroyed originals.
The anastatic engrossed (handwritten) Declaration is more important and definitely more rare than a copy of one of the reported 200+ Dunlap typeset (printed) copies distributed July 5, 1776, the last being sold at auction by Sotheby's for $8.
Lingenfelter's research uncovered the fact that Independence National Park possessed, unknowingly, since 1846, the only other known anastatic Declaration.