Very good material at this link.http://www.supportingevidences.net/the-three-witnesses/
Here is a sample.
In 1878, David Whitmer was asked by Parley Pratt to give his recollections of seeing the plates with Joseph and Oliver.
David Whitmer, who had been separated from the Church declared the following:
"It was in June, 1829--the latter part of the month, and the Eight Witnesses saw them, I think, the next day or the day after (i.e. one or two days after). Joseph showed them the plates himself, but the angel showed us (the Three Witnesses) the plates, as I suppose to fulfill the words of the book itself. Martin Harris was not with us at this time; he obtained a view of them afterwards (the same day). Joseph, Oliver and myself were together when I saw them. We not only saw the plates of the Book of Mormon, but also the brass plates, the plates of the Book of Ether, the plates containing the records of the wickedness and secret combinations of the people of the world down to the time of their being engraved, and many other plates. The fact is, it was just as though Joseph, Oliver and I were sitting just here on a log, when we were overshadowed by a light. It was not like the light of the sun nor like that of a fire, but more glorious and beautiful. It extended away round us, I cannot tell how far, but in the midst of this light about as far off as he sits (pointing to John C. Whitmer, sitting a few feet from him), there appeared, as it were, a table with many records or plates upon it, besides the plates of the Book of Mormon, also the sword of Laban, the directors--i. e., the ball which Lehi had, and the interpreters. I saw them just as plain as I see this bed (striking the bed beside him with his hand), and I heard the voice of the Lord, as distinctly as I ever heard anything in my life, declaring that the records of the plates of the Book of Mormon were translated by the gift and power of God." ("David Whitmer Interview" Millennial Star, vol. 40, nos. 49, 50, report of Pratt and Smith, is signed by them and bears date of Sept. 17, 1878.)
