An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the
United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Google Analytics Dashboard for QDF database system, version 1.0 : reflectance of ore minerals; a search-and-match identification system for IBM and compatible microcomputers using the IMA/COM quantitative data file for ore minerals, second issue, Part C - Executable QDF Program disk (serial port plotter)
QDF database system, version 1.0 : reflectance of ore minerals; a search-and-match identification system for IBM and compatible microcomputers using the IMA/COM quantitative data file for ore minerals, second issue, Part C - Executable QDF Program disk (serial port plotter)