This number relates to a particular quadrangle. To get a list of quadrangle names with their corresponding number, please check the Tools page. For data produced by other state agencies, it may or may not contain metadata. The best answer is to call or e-mail to find out. Again since we are a small agency our website sometimes takes a back seat to other projects and we are unable to update it as frequently as we'd like.
File size is another consideration.
If your question is about a certain data file, I may direct you to the agency that is responsible for that data. We can do simple conversions, but we charge for the data conversions. We will work to produce data only if it has some value to the North Dakota Geological Survey or to the State of North Dakota. We try to be open to new methods of creating digital data. If you have an idea or concept go ahead and ask, the worst that can happen is that we say no.