No.	Title	Date
21	Everglades	1978-03
22	Everglades
23	Everglades
24	Everglades National Park, Big Cypress Drainage Area, Gulf of Mexico
25	Everglades National Park, Collier County, Monroe County, Hendry County, 40-mile Bend, training airport	1980-01
26	Everglades, Taylor River	1980-02
27	First Day of Issue Program	1947
28	Flamingo Marina ( Stop 81- XX) ( 17 photograph sets )
29	Harney River (Stops 81-XXV) ( 23 photograph sets )
30	Hydrological monitoring station NP203, Alice Rudig, P. Rosendahl	1978-01
31	Hydrological monitoring station NP203, Alice Rudig, P. Rosendahl	1978-01
32	Hydrological monitoring station NP203, Alice Rudig, P. Rosendahl	1978-01
33	Hydrological monitoring station NP203, Alice Rudig, P. Rosendahl	1978-01
34	Hydrological monitoring station P36	1978-01
35	Hydrological monitoring station P36	1978-01
36	Hydrological monitoring station P36
37	Hydrological monitoring station P36	1978-01
38	Jewfish Key (Stop 81 - XV) ( 15 photograph sets )
39	Joe River (Stops 81-XXVII) ( 15 photograph sets )
40	Little Banana Patch & Shark River Headwaters (Stops XVII & XIX) ( 23 photograph sets )