The Yale Divinity School Library has scanned and posted online the following directories:

1904 Directory of Protestant Missionaries in China, Japan, and Corea:
http://divdl.library.yale.edu/dl/OneItem.aspx?qc=AdHoc&q=11995

1910 Directory of Protestant Missionaries in China, Japan, and Corea:
http://divdl.library.yale.edu/dl/OneItem.aspx?qc=AdHoc&q=11996

These PDF files are keyword searchable to the extent that our OCR software was able to decipher the text. We will post additional resources as they are scanned.