For research into the seventh division I need to obtain copies of the monthly returns for the Portugese Brigade. Can anyone assist?

I am undertaking a military history research degree and as a topic have chosen the cohesion of Wellingtons Army during the Peninsular War, examining the cohesion of the Seventh Division as an example. Part of the metrics I intend to use to quantify, if possible, is to look at the monthly regimental returns. I have, however. hit difficulties in obtaining information on the portugese brigade and am appealing for assistance. Unfortunately I do not speak portugese so any help will be extremely well received.