Should I Start Wearing a Mask? – NYTimes
It’s Time To Make Your Own Mask – NYTimes
What’s the best material for a mask – NYTimes
Stanford Researchers confirm N95 masks can be sterilized and reused with virtually no loss of filtration efficiency by leaving in oven for 30 mins at 70C / 158F

Ragmask – good fitting, cup type, simple mask with a nose contour – check the pro tips page for a quicker way to make this mask.
Masks4All
How to Sew A Mask – NYTimes
Face Sewing Mask Template – rather difficult looking pattern, pleated type
How to Sew Your Own Fabric Mask – WaPo – Difficult mask, no nose contour
Testing Mask Designs