1965 Winter, Skiers   Cod 51-54/65

U479  55B (1L) blue on white (4 images, same as u208)

1965 Birds   Cod 1/22-1  - 1/22-6 and 70 - 75/66

U480  55B (1L) blue on white (12 images, same as u226, see also U 492 (Cant see difference without cod-nr)

1965 Flowers   Cod 211, 369-76, 390/65   (My guess - U481 is with name of flowers, U487 is without name of flowers)

U481  55B (1L) blue on white SPECIALISED PAGE

1965 Iron Gate Project   Cod 386-7/65

U482  55B (1L) violet (2 images)

1965 Small Greeting covers   Cod 441/65 (U483) and 442/65 (U484)

1965 Five year plan 1965-70   Cod 474-81/65

1965 Mineral water   Cod 482/65

1966 Flowers   Cod 1/22-1  - 1/22-6 and 70 - 75/66

U487  55B (1L) blue on white (12 images: SPECIALIZED PAGE )

1966 People count   Cod 2-3/66

U488  55B (1L) blue on white (2 images)

1966 Views from the Black Sea   Cod 51-56/66

1966 Paintings   Cod 76-81/66

U490  55B (75B) lilac brown U490A 55B(75B) olive green (6 images: Gh. Petrascu: Vase and brushes, St. Dimitrescu: War ......., C.Ressu: Landscape in Sovaja, N. Darascu: Boats in Venice (shown) N.Tonitza: Vase w marguerites, N.Grigorescu)

1966 Butterflies   Cod 82-87/66

U491  55B (1L) blue on white paper (6 images)

1966 Birds   Cod 88 - 99/66  

U492  55B (1L) ultramarine on white (12 images)

1966 Union Congress   Cod 100/66

U493  55B (1L) ultramarine on white (1 image)

1966 Galati Fair   Cod 106/66

1966 Fishing   Cod 107-111/66  

U495  55B (1L) blue (5 images)

1966 Metrical system   Cod 152-57/66

U496  55B (1L) blue on white (6 images)

Cuza, Ghica, Kogalniceanu                                      Metereology Center Craiova                                Stefan Hepites

1966 Advertisments  Cod 105, 127-30, 147, 161-2, 170-72/66

U497  55B (1L) blue on white (11 images)

Hairdressers                                                           Sewing machine                                                     Vacuum cleaner  Radio                                                                     Washing machine                                                  Bicycle

1966 Traffic rules   Cod 105, 127-130, 147, 161-162, 170-172/66

U498     55B (1L) blue U498A  55B (1L) orange red (12 images)

1966 Paintings   Cod 184-89/66 220, 222/66

U499  55B (1L) blue on white U499A  55B (1L) brown on white (U 499- 6 colour  images: N.Grigorescu (3), Memling, Petrascu: Country house, Luchian: Washer woman) (U499A 2 brown images: Grigorescu: Ox cart near Oratii (shown), Sirato: Flowers

1966 EM Womens Basket Cluj   Cod 204/66

U500  55B (1L)violet on white (1 image)

1966 Water cleaning   Cod 260-62/66

U501  55B (1L) blue on white (3 images, earlier at U228)

1966 Winter, Mountains, cabins   Cod 484-95/66  506-11/66
My guess is: U502: Photos  U503: Colour drawings

U502  55B (75B) bluegrey
U503  55B(1L) blue

1966 Small greetings covers  No images   Cod 150 or 301/66

1966 Small greetings covers  No images, no adress text   Cod 441-2/66

1967 Winter views     Cod 3-8/67

U508  55B (1L) blue on white 6 images: Cabin (shown) Winter landscape Cabin Bilea

1967 Skiers     Cod 31-33/67   (Hard to differentiate between Winter views and skiers (U508/509) without cod nrs. So I guess.

U509  55B (1L) blue on white

1967 Birds and butterflies   Cod 34-37/67

U510  55B (1L) red on white  (hh) U511  55B (1L) red on white  (hi)

1967 Water sports and boats   Cod 38-43/67

U512  55B (1L) blue on white & images: Motorboat Excursion ship Sailboats 1 Sailboats 2 Freight boat Water ski (shown)

1967 Mountain flowers    Cod 50-57/66

U513  55B (1L) ultramarine on white 8 images: Galbinea de munte Caldarusa transilvaneana Micsandre de munte Micsunea de munte