In On the Evolution of Grammatical Forms, Heine and Kuteva show this page, without citing any sources that I could find:
They give a small sample of examples of how this might work, such as the verb "say" going to become a subordinating conjunction after evolution (sorry, the PDF is an image, so can't paste the original text).
Where can I find the research listing these "350 common grammaticalization pathways"? Where can I find more gathered collections of grammaticalization examples? I would really like to see a big set of examples of "grammaticalization", evolving from noun or verb into other POS's.
I have long been wondering if we can "get rid of prepositions", and grammaticalization points to exactly that! But in reverse, it at least shows how you can convert a preposition back into a verb or noun, which is amazing, and I would like to see more research on examples and such.

