What crankset/chainrings on 1990's cyclocross
Crank Set Types
Lots of different crank sets and chain rings were being used on cyclocross bikes in the mid 1990s. Some factors that influenced the parts selection process:


Price  
Availability  
Performance characteristics  
Personal preference


I don't know of any cyclocross specific crank sets.
To aid you in finding period appropriate parts and using Shimano as an example of one maker here is a link to a Shimano parts timeline.
Here is a link to a collection of Shimano catalogues from 1984 to 1997.

Number of Chain Rings
People used single, double, and triple chainrings
Here's a 1988 (it's a little older than the 90s but it's an example) Alan bike posted on bikeforums.net with a single chain ring:
  

Here's a Cicli B Cyclocross from the early 1990s that was sold on steel-vintage.com with a triple.


Gearing
According to Wikipedia  


  Gearing is typically lower, with most common setups using a 46-36 (110mm BCD) or 48-38 (130mm BCD) chainring combination with a 12-25 to 12-30 cassette. Some riders opt to use a single chainring in the front (typically a 40-42 tooth chainring) while retaining multiple sprockets in the rear cassette.


Since cyclocross is such an open ended sport it might be best to go with the gearing that fits your riding style.