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Krejcie & Morgan (1970) - Size 150 105mm Focal Length 160 Mm Acrylic Fresnel Lens Rectangle Concentrated Amplification Diy Projector Diy Projector Acrylic Fresnel Lensfocal Length Aliexpress

The ever increasing need for a representative statistical sample in empirical r… Baca selengkapnya Krejcie & Morgan (1970) - Size 150 105mm Focal Length 160 Mm Acrylic Fresnel Lens Rectangle Concentrated Amplification Diy Projector Diy Projector Acrylic Fresnel Lensfocal Length Aliexpress