Old leaflets

[Merkurius]

There are a couple of sources of instructions and year catalogues on the internet, but all the small leaflets that follow the sets? Is there any source/inventory of these?

[Junior Shark]

What do you mean by “small leaflets?” Do you have an example?

[LM71Blackbird]

You can check out lets build it again. There are hundreds of older Lego sets in their archive that might be of some help! 

[Johnny1360]

Small leaflets, like the ones that come in polybags or small promotional kits? 

[deraven]

Do you mean the single sheet folded set promos that they had in small sets, or the stapled ~10 page mini-catalogs that used to be included from time to time (or both)?

The booklets are often referred to as "Medium-size" catalogs (vs. the "Large" or seasonal "Shop at Home" full catalogs that were mailed out), and Brickset has a number of them in their scan archive like this one from 1988:

As for the folded, single-page ones, I've seen those calls "Small Catalog (Sheet)" or "Mini Catalog", and Peeron/PICSL has a few of them (and a lot more of the Medium ones):

http://www.peeron.com/cgi-bin/invcgis/scans/?ct=1

 

[Merkurius]

I mean the folded single sheets, in the early eighties often only showing city or classic space. In the mid-80s, there was single sheet folder divided into 6 squares a side, showing all themes. City, space, castle, technic...