![File:ASC Leiden - F. van der Kraaij Collection - 13 - 019 - The Firestone rubber plantation. Interior of the latex factory. A storage room with folded latex sheets - Harbel, Montserrado county, Liberia - 1976.jpg - Wikimedia Commons File:ASC Leiden - F. van der Kraaij Collection - 13 - 019 - The Firestone rubber plantation. Interior of the latex factory. A storage room with folded latex sheets - Harbel, Montserrado county, Liberia - 1976.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/ASC_Leiden_-_F._van_der_Kraaij_Collection_-_13_-_019_-_The_Firestone_rubber_plantation._Interior_of_the_latex_factory._A_storage_room_with_folded_latex_sheets_-_Harbel%2C_Montserrado_county%2C_Liberia_-_1976.jpg/2560px-thumbnail.jpg)
File:ASC Leiden - F. van der Kraaij Collection - 13 - 019 - The Firestone rubber plantation. Interior of the latex factory. A storage room with folded latex sheets - Harbel, Montserrado county, Liberia - 1976.jpg - Wikimedia Commons
![File:ASC Leiden - F. van der Kraaij Collection - 13 - 028 - The Firestone rubber plantation. A dam for hydro energy surrounded by bushes - Harbel, Montserrado county, Liberia - 1976.jpg - Outreach Wiki File:ASC Leiden - F. van der Kraaij Collection - 13 - 028 - The Firestone rubber plantation. A dam for hydro energy surrounded by bushes - Harbel, Montserrado county, Liberia - 1976.jpg - Outreach Wiki](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/ASC_Leiden_-_F._van_der_Kraaij_Collection_-_13_-_028_-_The_Firestone_rubber_plantation._A_dam_for_hydro_energy_surrounded_by_bushes_-_Harbel%2C_Montserrado_county%2C_Liberia_-_1976.jpg/2560px-thumbnail.jpg)
File:ASC Leiden - F. van der Kraaij Collection - 13 - 028 - The Firestone rubber plantation. A dam for hydro energy surrounded by bushes - Harbel, Montserrado county, Liberia - 1976.jpg - Outreach Wiki
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Air Duct Air flow rate (CFM) measurements, Tools, & data for buildings, air conditioners, warm air furnaces
![File:ASC Leiden - F. van der Kraaij Collection - 13 - 010 - The Firestone rubber plantation. A rubber tapper with a bucket, a paved road with people - Harbel, Montserrado county, Liberia - 1976.jpg - Wikimedia Commons File:ASC Leiden - F. van der Kraaij Collection - 13 - 010 - The Firestone rubber plantation. A rubber tapper with a bucket, a paved road with people - Harbel, Montserrado county, Liberia - 1976.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/2/2a/ASC_Leiden_-_F._van_der_Kraaij_Collection_-_13_-_010_-_The_Firestone_rubber_plantation._A_rubber_tapper_with_a_bucket%2C_a_paved_road_with_people_-_Harbel%2C_Montserrado_county%2C_Liberia_-_1976.jpg)