Items

• [NB172AAB], Technical Note, Joseph W Valentine, Walter Elam Holland, August 1907
  1907-08-00
• [NB172AAC], Technical Note, Joseph W Valentine, Walter Elam Holland, September 1907
  1907-09-00
• [NB172AAD], Technical Note, Walter Elam Holland, Joseph W Valentine, October 1907
  1907-10-00