The third photograph identified by Marina Oswald depicts the entrance to General Walker’s driveway from a back alley.[C4-720] Also seen in the picture is the fence on which Walker’s assailant apparently rested the rifle.[C4-721] An examination of certain construction work appearing in the background of this photograph revealed that the picture was taken between March 8 and 12, 1963, and most probably on either March 9 or March 10.[C4-722] Oswald purchased the money order for the rifle on March 12, the rifle was shipped on March 20,[C4-723] and the shooting occurred on April 10. A photography expert with the FBI was able to determine that this picture was taken with the Imperial Reflex camera owned by Lee Harvey Oswald.[C4-724] (See app. X, p. 596.) A fourth photograph, showing a stretch of railroad tracks, was also identified by Marina Oswald as having been taken by her husband, presumably in connection with the Walker shooting.[C4-725] Investigation determined that this photograph was taken approximately seven-tenths of a mile from Walker’s house.[C4-726] Another photograph of railroad tracks found among Oswald’s possessions was not identified by his wife, but investigation revealed that it was taken from a point slightly less than half a mile from General Walker’s house.[C4-727] Marina Oswald stated that when she asked her husband what he had done with the rifle, he replied that he had buried it in the ground or hidden it in some bushes and that he also mentioned a railroad track in this connection. She testified that several days later Oswald recovered his rifle and brought it back to their apartment.[C4-728] _Firearms identification._--In the room beyond the one in which General Walker was sitting on the night of the shooting the Dallas police recovered a badly mutilated bullet which had come to rest on a stack of paper.[C4-729] The Dallas City-County Investigation Laboratory tried to determine the type of weapon which fired the bullet. The oral report was negative because of the battered condition of the bullet.[C4-730] On November 30, 1963, the FBI requested the bullet for ballistics examination; the Dallas Police Department forwarded it on December 2, 1963.[C4-731]