Aqueous solutions of heavy salts such as iodine or barium chloride and vaporous agents such as chloroform have been used as contrast agents. Radiographs can be made on PolaroidAr film, x-ray paper, or x-ray film. Polaroid film is useful ifanbsp;...
|Title||:||The Woody Plant Seed Manual|
|Author||:||F. T. Bonner, Robert P. Karrfalt|
|Publisher||:||Government Printing Office -|