- Search terms are automatically joined by AND and truncated with *
- use / for OR
e.g. lake / ocean / sea
- use ! for NOT
e.g. water ! lake
- use " " to search for a phrase
e.g. "acid precipitation"
- use >, <, >=, <= for greater or less than
e.g. >= 2007 finds dates from 2007 onwards
- use : to search a range
e.g. 2001:2012, example:sample
- More help is available.