We have developed a system that uses multiple radiographic views and modern survey instruments to determine the locations and sizes of hidden objects. The survey instrument is a total station that combines a transit for angle measurements and a range finder for determining the exact locations of the film plane and radiographic source for each radiographic view. This information coupled with the location of an object’s image on the film defines a line in three-dimensional space. Using two or more views, we locate the object by finding the intersection of these lines. Because of experimental error in each survey measurement, the lines may not intersect, but we use the point of nearest approach. Experience with the system has shown that we can locate objects to within a 5-mm cube and determine the sizes of objects to better than 1 mm.