A small clarification regarding the dating of Ives' compositions.
Ives had the habit of building his compositions through an accumulation of ideas that developed over several years.
He would jot down ideas as they came to mind in the most disparate places: three bars in the margin of another score he was working on, a series of chords on the back of a calendar, and so on. See a list here: http://www.flaminioonline.it/Biografie/Ives-frammenti.html
Every now and then he would fish up these ideas, stitch them together, then abandon them again, and after some time take them up once more, adding more material.
When the compositions were complete, he would revisit them again, stitching three or four scores together to create orchestral Sets.
Furthermore, he was a man of absolute disorder, and he himself could no longer remember the dates of his works.
All his attempts to bring order to his work have done nothing but create confusion. His diaries, for example, contain the same compositions on different dates.
From the above, it can be deduced that it is absolutely impossible to establish a serious dating for Charles Ives' compositions.
All this is better explained by James Sinclair in the introduction to his catalogue of Charles Ives and can be consulted on the dedicated page of Yale University.
http://drs.library.yale.edu/HLTransformer/HLTransServlet?stylename=yul.ead2002.xhtml.xsl&pid=music:mss.0014.1&query=&clear-stylesheet-cache=yes&hlon=yes&big=y&adv=&filter=&hitPageStart=&sortFields=&view=over#did