I have just developed an intrest in making dioramas and was wondering if anyone can help me find a source for scale drawings 1/35 for buildings or some information on how to scale photographs effectively
thanks in advance

Hello I can suggets you that search in google under the label: free paper models.
Here one web for Start:
here you can find a entire german town:
http://www.grundschule-pretzschendorf.de/Werken/Weihnachtsberg/weihnachtsberg.html#bastelboegen

you only need print all these modeles and afther grow it to is appropiated size
for other dessing ( some of them french from Picadie and bretagne) take the same web but here:

http://www.papiermodelle.de/component/option,com_remository/Itemid,81/func,select/id,22/
this page is in german but can be read in english and french also
hope that this helps
Carlos

thanks Carlos thats some inspiring work you have done