See: www.unece.org/env/eia/eia.htm

The consolidated text (including first and second amendments) of the Convention is available in English (unofficial).

Signatories.

Protocol on Strategic Environmental Assessment (Kiev, 2003) (see www.unece.org/env/eia/sea_protocol.htm)
The Protocol was adopted by an Extraordinary meeting of the Parties to the Espoo Convention, held on 21 May 2003 during the Ministerial 'Environment for Europe' Conference (Kiev).

Text of the Protocol in English (PDF).