Theses awarded by American, Canadian and some European Universities can be located using ProQuest Dissertations and Theses: Global which includes full text from 1997. Going back to 1743, this is a computer searchable database available offsite for authorised users. Some theses are also being made available on an open access basis on the PQDT Open website. Others may be ordered on Dissertation Express.
OpenDissertations is an EBSCO open-access database which incorporates American Doctoral Dissertations, and information about theses contributed by select colleges and universities from around the world. While the database does not contain the full text it does have links to ETHOS or Institutional repositories, for the British theses it includes.
In order to consult a thesis from abroad which is not available via this service it is advisable to ask your college library (or the British Library if you are a member there) if they can organise an inter-library loan. If you are not a member of another library we can organise an inter-library loan on your behalf, but there is a charge
There is a gateway for European e-theses at DART-Europe E-theses Portal.