Question: Who wrote, "Pinpointing the Past in Washington, D.C."?
About the article "Lincoln Memorial", section "Sculptural features".

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 Administration Building, Carnegie Institution of Washington, Washington, D.C., listed on the NRHP in Washington, D.C.  
 St. Mark's Episcopal Church (Washington, D.C.), listed on the NRHP in Washington, D.C.  
The sculpture has been at the center of two urban legends.
Some have claimed that the face of General Robert E. Lee was carved onto the back of Lincoln's head, and looks back across the Potomac toward his former home, Arlington House, now within the bounds of Arlington National Cemetery.
Another popular legend is that Lincoln is shown using sign language to represent his initials, with his left hand shaped to form an "A" and his right hand to form an "L", the president's initials.
The National Park Service denies both legends.
However, historian Gerald Prokopowicz writes that, while it is not clear that sculptor Daniel Chester French intended Lincoln's hands to be formed into sign language versions of his initials, it is possible that French did intend it, because he was familiar with American Sign Language, and he would have had a reason to do so, that is, to pay tribute to Lincoln for having signed the federal legislation giving Gallaudet University, a university for the deaf, the authority to grant college degrees.
The National Geographic Society's publication, "Pinpointing the Past in Washington, D.C." states that Daniel Chester French had a son who was deaf and that the sculptor was familiar with sign language.
Historian James A. Percoco has observed that, although there are no extant documents showing that French had Lincoln's hands carved to represent the letters "A" and "L" in American Sign Language, "I think you can conclude that it's reasonable to have that kind of summation about the hands."
  Music of Washington, D.C.
Outdoor sculpture in Washington, D.C.  Theater in Washington, D.C.  
Some have claimed, erroneously, that Confederate general Robert E. Lee's face is carved onto the back of Lincoln's statue, looking back across the Potomac at Arlington House (Custis-Lee Mansion) in Arlington National Cemetery.
Another popular legend is that Lincoln is shown using sign language to represent his initials, with his left hand shaped to form an "A" and his right hand to form an "L".
The National Park Service denies both stories, calling them urban legends.
However, historian Gerald Prokopowicz writes that, while it is not clear that sculptor Daniel Chester French intended Lincoln's hands to be formed into sign language versions of his initials, it is possible that French did intend it, because he was familiar with American Sign Language, and he would have had a reason to do so, i.e., to pay tribute to Lincoln for having signed the federal legislation giving Gallaudet University, a university for the deaf, the authority to grant college degrees.
The National Geographic Society's publication, "Pinpointing the Past in Washington, D.C." states that Daniel Chester French had a son who was deaf and the sculptor was familiar with sign language.
Historian James A. Percoco has observed that, although there are no extant documents showing that French carved Lincoln's hands to represent the letters "A" and "L" in American Sign Language, "I think you can conclude that it's reasonable to have that kind of summation about the hands."