IOS Inc.
The Brewer experts
Important:
SETDATE: Automatic date correction in the OP_ST.### file before running the Brewer software. 
01.12.2005.
Calibration information tables. 09.12.2005.
How to find calibration information 25.01.2006.
Brewer operating software v3.76b 26.08.2008.
GWBasic: A help file. 12.12.2005.
Calibrations in 1990:
| Location | Country | Instruments | Month in 1990 | Julian days |
| Sodankyla | Finland | June | ||
| Casablanca | Morocco | July | ||
| Arosa | Switzerland | August | ||
| Kislovodsk | Russia | August |