These will be rolls of prints just as they have been produced from the original negative as soon as possible after the shooting [and seen by the camera crew "daily"]. They vary in grading considerably. In the 1930’s and in the early days of negative/positive colour in the 1950's they were often of poor quality.
However, by the 1970's the quality was high. Rushes are rare. They can usually be recognised if they are from a feature film production by the repetition of the same scenes shot repeatedly until acceptable to the director.
Rushes were generally cut up to produce an edited story called the cutting copy.
You might find the so-called rushes: the printing (more or less balanced) of all the material that has been shot and that will be used in the editing phase. You'll find the takes, with repetitions of each scene, which obviously won't be edited. Usually the rushes aren't combined, that is, they are without soundtrack.