Prehistoric animals - 6 v.

Prehistoric animals - 6 v. (sheetlet)

Butterflies - 6 v.

Butterflies - 6 v. (sheetlet)

Definitives: Farm animals (I part) - 4 v.

Definitives: Farm animals (II part) - 1 v.

Horse races - 6 v.

Definitives: Farm animals (III part) - 5 v.

Decorative dogs - 6 v.

Sea mammals - 6 v.

Definitives: Farm animals (IV part) - 1 v.

Definitives: Insects (I part) - 2 v.

Definitives: Insects (II part) - 2 v.

Exotic predatory animals - 6 v.

Night birds of prey - 6 v.

Decorative fishes - 6 v.

Game - 6 v.

Definitives: Insects (III part) - 4 v.

Prehistoric animals - 6 v.

WWF, Hamsters - 4 v.

Third Ministerial Conference Environment for Europe - s/s

Antarctic species - 6 v.

Crabs - 6 v.

Pure-breed small dogs - 4 v.

Cat races - 4 v.

International Year of World Ocean - s/s

Butterflies and wild flowers - 4 v.

European philatelic exhibition Bulgaria 1999, Parrots - s/s

Europa 1999: Parks and reserves - 2 v.

Songbirds and nests - 4 v.

Protected animals in Bulgaria, Tortoises - 4 v.

Environment protection, Storks - s/s

Animals acclimatized in Bulgaria - 4 v.

Egyptian vulture - 4 v.

4515/18

International day for Black Sea protection - s/s

Balkan Maximaphilia Championship BALKANMAX - s/s

10th Bulgarian Antarctic expedition - s/s

Rooster races - 4 v.

Prehistoric animals - 4 v.

Bees - 4 v.

Definitives: Night butterflies - 4 v.

Birds of prey preservation and Black Sea protection - s/s

WWF Beluga Sturgeon - 4 v.

Dragonflies - 4 v.

Spiders - 4 v.

Ecology - s/s

Birds of prey - 4 v.

Ecology - 15th anniversary of Nature reserve Ropotamo - s/s

Protected Birds - 4 v.

International Polar Year 2007/2008 - s/s with 2 v. & 2 labels

120th anniversary of Sofia Zoo - m/s of 6 v.

120th anniversary of Sofia Zoo - imperforated s/s

Natural Park Strandzha - s/s

Ecology - Balkan Mountains, Joint issue with Serbia - m/s of 5 sets

Ecology - Balkan Mountains, Joint issue with Serbia - imp. s/s

Preserve the Polar Regions and Glaciers - s/s

Night birds of prey - m/s of 2 sets