00323nam a2200145Ia 450000500170000002000180001708200080003510000160004324500540005925000060011326000270011930000080014650000080015465000150016220250725173023.0  a0-442-22812-0  a578  aGray, Peter 0aThe Encyclopedia of Microscopy and Microtechnique  a-  aNew YorkbVan Nostrand  a638  a114  aMicroscopy