DuckTales help needed

[Daniel van Eijmeren]

This information is taken from an e-mail by Christopher E. Barat, sent 
to the Disney Comics Mailing List on 18 August 1998:

> [...] there were a few sequences in other [DuckTales] episodes that 
> were clearly adapted from Barks stories, such as the use of the 
> money-dam scenario and the "movable money bin" from "Only a Poor Old 
> Man" and the backup story in Uncle $crooge No. 15 in the first part of 
> the "Gizmoduck" serial.

Which DuckTales episode is meant here, containing both the money-dam 
scenario (OS 386-02) and the movable money bin (US 15-05)? 

I think it could be one these episodes, though I'm not sure:
1st Season (1988-1989) - #027 A Drain In the Economy (Part 1)
2nd Season (1989-1990) - #066 Marking Time (Part 1)
2nd Season (1989-1990) - #079 The Golden Goose (Part One)
2nd Season (1989-1990) - #081 Liquid Assets (Part 1)

List of DuckTales episodes, with part-identification of the serials: http://www.pazsaz.com/ducktale.html

List of DuckTales episodes, with original air dates:
http://www.geocities.com/supreme182/Duck-Tales.html

--- Daniël