Waterfalls/Rivers on Sunday Stamps - Norway, USA, New Zealand

 I'm not sure that this is a waterfall in Norway but it certainly looks like one.

Norway - 13 June 1979

I was working in Stavanger at the time it was issued a came from a scenery series, this one depicting fauna, mammals and horses.

A ship's wheel and a power transmission tower (pylon) appeared on this Arkansas River Navigation stamp from the USA.

USA - 1 October 1968

Somehow I think you might need a map or sat-nav to find your way from Minnesota to Louisiana along the Great River Road through 10 States to follow the course of the Mississippi.

USA - 21 October 1966

The Peace issue from New Zealand in 1946 include a stamp showing Lake Matheson.

New Zealand - 1 April 1946

The lake formed in a hollow left by the Fox Glacier. Although it is not clear in the stamp, the Clearwater River drains out of the lake.

For more waterfalls and rivers just check the links to be found at Falls

Unknown Yellow - Sunday Stamps

The yellow theme this week proved more difficult than I expected. However, as you will see, it allows me to appeal for help.

There is no problem with my first stamp as it tells me what it is.

USA

This stamp was issued in 1966 to publicise the largely undivided highway following the Mississippi River from New Orleans to Ontario, Canada.

My second stamp is the one I know nothing about. I don't remember when I acquired it but it has obvious been soaked off an envelope. It has no distinguishing features that I can see which allow me to identify where it is from.

I don't even know whether I have presented this the right way up. 

I hope you will be able to help me identify which country issued it.

Meanwhile for less mysterious stamps please pop over to Viridian's sunday-stamps-78

I've just realised that this is my 400th post so help me celebrate by solving my query.